Ultraviolet light is typically divided into three categories. UV-A, with wavelengths between 400 and 320 , has been linked with malignant melanomas. UV-B radiation, which is the primary cause of sunburn and other skin cancers, has wavelengths between 320 and

18,277 results
  1. physics

    In a double-slit experiment, two beams of coherent light traveling different paths arrive on a screen some distance away. What is the path difference between the two waves corresponding to the third bright band out from the central bright band? The path

  2. physics

    The human eye is most sensitive to light having a frequency of about 5.3*10^14 Hz, which is in the yellow-green region of the electromagnetic spectrum. How many wavelengths of this light can fit across the width of your thumb, a distance of about 2.0 cm?

  3. AP CALCULUS

    A girl is flying a kite at a height of 320 ft. If the wind blows the kite horizontally at a rate of 15 feet per second away from the girl, at what rate is the girl releasing the string when the length of the string is 400 ft? [kite]

  4. physics

    A 75 W light source consumes 75 W of electric power. Typically only about 5% of this energy is emitted as visible light of wavelength 600 nm. (a) Calculate the frequency of the emitted visible light. (b) How many photons per second of visible light does

  5. Science

    What is the order of the electromagnetic spectrum from highest to lowest energy. I got Radio, Microwave, Infrared, Visible light, Ultraviolet light, X-ray, and Gamma ray. Am I correct? If not, please help me so I can put it in the right order.

  6. Physical Science

    QUESTION---Which waves have wavelengths longer than those of visible light? MY ANSWER--Infrared light, microwaves and radio waves have wavelengths longer than visible light. Radio waves have the longest wavelength. Are there any others?

  7. Science

    White light moves through a prism and separates into colors in the following order: red, orange, yellow, green, blue, and violet. Which of the following choices correctly describes why the violet ray is at the bottom while the red ray is at the top? Red

  8. Physics. URGENT Help Please

    What is the separation of colors in a rainbow produced by? (Points : 1) different diffraction for different wavelengths different interference for different wavelengths

  9. Science

    Identify the dependent and independent variables in the following experiments. 1. Height of bean plants is recorded daily for 2 weeks. 2. Percent absorption by a pigment is measured for red, blue, green, and yellow wavelengths of light. My thought process:

  10. Chemistry

    The SI unit of length is a meter, which is defined as the length equal to 1,650,763.73 wavelengths of light emitted by a particular energy transition in krypton atoms. Calculate the frequency of the light to three significant figures.

  11. Physics

    Ultraviolet radiation is part of the electromagnetic spectrum that has wavelengths in the range of 200 nm to 400 nm. Given that the speed of all forms of electromagnetic radiation is 3.0 × 10^8 m/s, calculate the frequency range of ultraviolet radiation.

  12. Chem

    Calculate the frequency associated with light of wavelength 656nm. (this corresponds to one of the wavelengths of light emitted by the hydrogen atom.)

  13. Physics

    We can reasonably model a 75 W incandescent light bulb as a sphere 6.0 cm in diameter. Typically, only about 5% of the energy goes to visible light; the rest goes largely to non-visible light infrared radiation. (a) What is the visible light intensity (in

  14. Estimation decimal quotient

    Use compatible numbers to find the each quotient ,2.90 divided by 29,48 divided by 3.2, 0.18 divided by 0.33,152 divided by 5.12,41.9 divided by 19,33.90 divided by 10.2, 502 divided by 9.5, 180.8 divided by 6 , 48 divided by 3.33, 0.65 divided by 5.1,18.2

  15. Science

    1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm? Answer in units of s−1 . 2.Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths

  16. physics

    The wavelengths of various colours of light can vary. Violet light can have a wavelength of 400 nm and red light can have a wavelength of 700 nm. If these two colours of light pass by a very sharp edge such as a razor blade, which light will bring about

  17. physics

    A film of oil that has an index of refraction equalto 1.45 floats on water (n = 1.33). When illuminated by white light at normal incidence, light of wavelengths 629 nm and 449 nm is predominant in the reflected light. Determine the thickness of the oil

  18. Chemistry

    What is the wavelength of the electromagnetic radiation emitted from a hydrogen atom when the electron undergoes the transition n = 5 to n = 3?((Broken Link Removed) is a spectrum m In what region of the spectrum does the line occur? near ultraviolet far

  19. Physics

    The refractive index of a medium changes with the wavelength of incident light. Typically, the shorter the wavelength the larger the refractive index. Fused quartz has a refractive index of 1.47 for indigo light of 400 nm in wavelength, and a refractive

  20. Chemistry

    What is the wavelength of maximum absorption by caffeine of ultraviolet-visible light (200 nm to 800 nm)

  21. physics

    What is the minimum work function for a metal for visible light (wavelengths between 400 and 700 ) to eject photoelectrons?

  22. science

    Electromagnetic radiation with a wavelength of 700 nm would be: a)x-rays b)red light c)violet light d)ultraviolet light e)microwaves I thought it would be visible light but that's not an option.

  23. chem

    Briefly explain why the transitions associated with the Lyman series correspond to wavelengths in the ultraviolet region of the electromagnetic spectrum.

  24. Physics

    The human eye can detect light of wavelengths up to 400 nm. Calculate the temperature at which a heated piece of metal would start to emit visible light (start to glow red). I used Wien's law and got 7,250 K, but I'm not sure if it's correct since metal

  25. astronomy

    A line in star's spectrum lies at 400.0 nanometers. In the laboratory, that same line lies at 400.2 nanometers. How fast is the star moving along the line of sight; that is, what is its radial velocity? Is it moving toward or away from us? Since the

  26. Physics

    Ultraviolet light causes sunburns, whereas visible light, even of greater intensity, does not. Why?

  27. Physics

    In an interference of light experiment, coherent light that contains two wavelengths: 640 nm (red-orange) and 425 nm (indigo-blue), passes through two narrow slits separated by 5.35 μm, and the interference pattern is observed on an observation screen

  28. Physics

    A mixture of light with wavelength 540 nm and light with wavelength 400 nm is aimed at a pair of slits to produce a double-slit interference pattern. Which of these will be true? The pattern will be the same for both wavelengths. The central maximum will

  29. chemistry

    The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2) a)182 nm b)103 nm c)97 nm d) 95 nm e)

  30. Chemistry(I'm sooo confused here!)

    The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2) a)182 nm b)103 nm c)97 nm d) 95 nm e)

  31. PHYSICS- please help! i cant get my last problem

    The compound eyes of bees and other insects are highly sensitive to light in the ultraviolet portion of the spectrum, specifically light with wavelengths between 300.0 nm and 400.0 nm. To what frequencies do these wavelengths correspond? (Assume that the

  32. Science

    D. _____ has wavelengths between 0.7 and 0.4 millionths of a meter. D1. What you see as different colors are electromagnetic waves of different ______. D2. Red ligh has the _____ wavelengths (lowest frequency); blue light has the _____ wavelengths (highest

  33. Science

    Does infrared radiation or ultraviolet radiation have wavelengths that are shorter than visible light? My answer is ultraviolet radiation. I am really sure about this one. Am I correct?

  34. Physics

    A certain type of laser emits light that has a frequency of 4.7 1014 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.8 10-11 s. (a) How many wavelengths are there in one pulse? (b) The light enters a pool of water.

  35. Physical Science

    Why is metal shiny? A. The electrons absorb each light wave. B. The loose electrons reflect most wavelengths of light. C. The electrons emit light due to electronic excitation. D. The electrons transmit most wavelengths of light. (I think the answer is B,

  36. physical science

    Visible light consists of electromagnetic waves with wavelengths (in air) in the range 400 - 700 nm. What are the frequencies of visible light?

  37. Science

    A scientist sets up an experiment to see if plants grow faster under only ultraviolet light. Which setup has the correct use of an experimental control? A. All of the plants are outside B. some plants are outside, some plants are inside under an

  38. chemistry

    The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2)

  39. physics

    A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 50.0°. The index of refraction of quartz is 1.455 at 660 nm (red light), and its index of refraction is 1.468 at 410 nm (violet light). Find the

  40. Physics

    Light containing two different wavelengths passes through a diffraction grating with 1300 slits/cm. On a screen 16.0 cm from the grating, the third-order maximum of the shorter wavelength falls midway between the central maximum and the first side maximum

  41. Physical Science

    I need help with some of these questions: 1.If you look at a red leaf, what describes what happens when you see it? A.The leaf absorbs red light from our eyes B.Our eyes reflect red light back to the leaf C.Red light reflected from the leaf enters our eyes

  42. Physics

    We hear people talk of "ultraviolet light" and "infrared light." Why are these terms misleading? Why are we less likely to hear people talk of "radio light" and "X-ray light"?

  43. physic of modern technology

    A standard 2500„aC light bulb produces what fraction of its light at wavelengths that cannot be detected by the human eye as visible light? You can submit the answer as a decimal fraction or as a percent, so that if the answer were one half, you could

  44. economics

    P 2 3 4 5 6 7 8 9 10 11 12 13 14 QD 400 380 360 340 320 300 280 260 240 220 200 180 160 QS 40 80 120 160 200 240 280 320 360 400 440 480 520 Suppose the quota is lifted and a price ceiling of 11 is imposed. Find the new market price. How much will be

  45. science/ chemistry

    Ethane (C2H6) is one of the many products of combustion of iso-octane, an important component of petrol. After release into the atmosphere, it is attacked by the hydroxyl radical, HO•, leading to its oxidation in the cycle of reactions when in a NOx-rich

  46. chem-help

    the bright yellow light emitted by a sodium vapor lamp consists of two emission lines at 589.0 and 589.6 nm. what are the frequency and the energy of a photon of light at each of these wavelengths? what are the enegies in kJ/mol

  47. SCIENCE

    This assignment is dealing with the electromagnetic spectrum. I have some questions to ask you. 1. Which waves can be used to SEE molecules? 2. Why can't you use visible light to SEE molecules? 3. Some insects like bees can SEE light of shorter wavelengths

  48. Chemistry

    Sodium vapor lamps are often used in residential street lighting. Sodium gives off two yellow lines of light having frequencies of 5.09 × 1014 Hz and 5.08 × 1014 Hz. What is this wavelengths of light in nm? would I start by using the following formula

  49. Physics

    Hi, I have the following question: 1. The index of refraction for a prism is given by the equation: n = 1.58 − (6.41 x 10^4)λ where λ is the wavelength in meters. Light is incident at 28°. Find the exit angle ß for light of a) 800 nm b) 633 nm c) 540

  50. physics

    Ultraviolet light is typically divided into three categories. UV-A, with wavelengths between 400 and 320 , has been linked with malignant melanomas. UV-B radiation, which is the primary cause of sunburn and other skin cancers, has wavelengths between 320

  51. Algebra Assignment

    Please check my work on this part of the assignment. Medical x-rays, with a wavelength of about 10^-10m, can penetrate completely through your skin. a. ultraviolet rays, which cause sun burn by penetrating only the top level of skin, have a wavelength

  52. Algebra I

    Here is the question. Medical X-rays, with a wavelength of about 10^-10m, can penetrate completely through your skin. a. Ultraviolet rays, which cause sun burn by penetrating only the top level of skin, have a wavelength about 1000 times the wavelength of

  53. Physical Science

    These are two questions that I need help with: 1.What statement about light traveling through water and glass is true? A.Water and glass absorb different colors of light B.Light changes colors as it passes from water to glass C.Light travels at different

  54. physics ...plzzzz help...

    Why is glass transparent to visible light but opaque to ultraviolet or infrared light ?? can anyone give me a detailed explanation for it coz i knw the general thing that because they have different wavelengths.....

  55. Physics

    In the process of fluorescence, an atom ab- sorbs a photon of ultraviolet light and emits two or more photons of visible light. Is the reverse process possible? (That is, is it possible for an atom to absorb a photon of visible light and emit photons of

  56. Science

    A certain type of laser emits light that has a frequency of 4.0 × 1014 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.3 × 10-11 s. (a) How many wavelengths are there in one pulse? (b) The light enters a pool of

  57. physics

    briefly describe how you could demonstrate the release of electrons fro a metal it is radiated wilt ultraviolet light.Also sate how the intensity of ultraviolet light effect the number of electrons

  58. Chem

    How many orbitals are in the p sublevel? A 2 B 3 C 4 D 5 A? Place gamma rays, infrared, microwaves, radio waves, ultraviolet, visible light, and x-rays in order from largest wavelength to smallest wavelength. A Gamma rays, infrared, microwaves, radio

  59. Science

    Which part of the electromagnetic spectrum is divided into seven ranges of wavelengths and is the part visible to the human eye? A Television waves B Visible light C infrared light D telemetry waves I believe it's visible light?

  60. chemistry

    The glass panels of a sky roof need to be coated in order to screen out ultraviolet radiation (10-400 nm wavelength) but without color distortion in the visible spectrum. Candidate coating materials are gallium nitride (GaN) with a band gap,Eg, of 3.2 eV,

  61. Chemistry

    The glass panels of a sky roof need to be coated in order to screen out ultraviolet radiation (10-400 nm wavelength) but without color distortion in the visible spectrum. Candidate coating materials are gallium nitride (GaN) with a band gap,Eg, of 3.2 eV,

  62. physics

    the wavelength of ultraviolet radiation is 400nm. if the speed of light in air is exactly 3*10^8m/s, then the frequency of the ultraviolet radiation is? a). 1.3*10^-13hz b). 7.5*10^5hz c) . 1.2*10^11hz d) . 7.5*70^14hz?

  63. physics

    what are the units of wavelengh They can be any length units, but it is common to use meters for radio waves, centimeters for microwaves, micrometers for infrared, and nanometers or Angstroms (10^-8 cm) for visible and ultraviolet light. Regardless of what

  64. physics

    White light strikes a grating with 1300 lines/cm at normal incidence. How many complete visible spectra will be formed on either side of the central maximum? (Take the range of visible wavelengths to be 400 - 700 nm.) I used the equation d sintheta = m

  65. physics!!!

    A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 45.0°. The index of refraction of quartz is 1.455 at 660 nm (red light), and its index of refraction is 1.468 at 410 nm (violet light). Find the

  66. physics

    An object emitting 500nm wavelength light moves away from you at half of the speed of light. What is the observed wavelengths of the light?

  67. Chemistry

    If you have red solution, at what wavelengths should it absorb light, at what wavelengths should it NOT absorb light?

  68. chemistry-light

    the SI Unit of length is meter,which is defined as the lenght equal to 1,650,763.73 wavelengths of light of the light emitted by a particuar energy transition in krypton atoms.calculate the frequency of the light to three significan figures.

  69. Chemistry

    Suppose that a PES experiment is performed in which mercury vapor is irradiated with ultraviolet light of wavelength 58.4 nm. What is the energy of a photon of this light, in eV?

  70. Physics

    The refractive index of a material is different for different wavelengths and colours of light. For most materials in the visible range of the electromagnetic spectrum, shorter wavelengths have larger refractive index compared to longer wavelengths. The

  71. Physics

    In an interference of light experiment, coherent light that contains two wavelengths: 614 nm (red-orange) and 429 nm (indigo-blue), passes through two narrow slits separated by 3.12 μm, and the interference pattern is observed on an observation screen

  72. Longitudinal wave problem (tunning fork)

    I have this for a physics question A 320 hz tuning fork vibrates for 8s. During this time each tine of the fork travels a total distance of 10.3 cm. first I multiplied 320 by 8.( 2 560) then i divided 10.3 by 2 560. then i divided that answer by 4 since

  73. Physics

    In an interference of light experiment, coherent light that contains two wavelengths: 640 nm (red-orange) and 425 nm (indigo-blue), passes through two narrow slits separated by 5.35 μm, and the interference pattern is observed on an observation screen

  74. physics

    A diffraction grating having 180 lines/mm is illuminated with a light signal containing two wavelengths, λ1 = 400 nm and λ2 = 500 nm. The signal is incident perpendicularly on the grating. What is the smallest angle at which two of the resulting maxima

  75. chemistry

    The glass panels of a sky roof need to be coated in order to screen out ultraviolet radiation (10-400 nm wavelength) but without color distortion in the visible spectrum. Candidate coating materials are gallium nitride (GaN) with a band gap,Eg, of 3.2 eV,

  76. Physics

    You have probably seen films of astronauts floating weightless in orbiting satellites. People often get the idea that the astronauts are weightless because they are so far from the gravity of the earth. Let us see if that explanation is correct. Typically,

  77. physics

    You have probably seen films of astronauts floating weightless in orbiting satellites. People often get the idea that the astronauts are weightless because they are so far from the gravity of the earth. Let us see if that explanation is correct. Typically,

  78. Environmental Science

    #35. In two or three well-developed paragraphs, list the populations that are affected by ultriviolet light and identify the effects on each of these populations. my answer: There are four major populations that are affected by ultraviolet light. These

  79. Physics

    a) A distant spaceship carrying a red headlight, emitting light with wavelength 600 nm, is heading towards the earth. Observers on the earth detect the light from the headlight as ultraviolet light with wavelength 200 nm. What is the velocity of the

  80. physics

    What type of EM radiation has the highest energy per quantum (the energy of one photon)? A. FM radio B. AM radio C. ultraviolet light D. microwaves E. infrared light F. x-rays ****

  81. Algebra

    Joshua originalle bought two hundred shares of stock three years ago. The company has since had a 2 for 1 stock split. Joshua's entire investment in stock has increased in value by 20%. He originally paid $8,600 for the stock. What is the current price per

  82. Science

    Calculate the energy of a photon of ultraviolet light of wavelength 200nm

  83. physics

    Modern lasers can create a pulse of light that lasts only a few femtoseconds. (a) What is the length of a pulse of red light that lasts 6.2 fs? (b) How many wavelengths of red light (ë = 680 nm) are included in such a pulse?

  84. physics

    Modern lasers can create a pulse of light that lasts only a few femtoseconds. (a) What is the length of a pulse of red light that lasts 6.2 fs? (b) How many wavelengths of red light (ë = 680 nm) are included in such a pulse?

  85. PHySICS

    A double slit experiment is performed with monochromatic light. The separation between the slits is 1.150mm apart and an interference pattern is noticed on a screen 3.90m away. If the second fringe is 4.20mm from the central fringe, what wavelength and

  86. Physics

    A 75 W light source consumes 75 W of electric power. Typically only about 5% of this energy is emitted as visible light of wavelength 600 nm. (a) Calculate the frequency of the emitted visible light. (b) How many photons per second of visible light does

  87. quick chem

    Which of the following wavelengths of light has the highest energy? 1. 10 mm 2. 650 nm 3. 10 µm 4. 0.1 nm 5. 10 cm

  88. science

    In the process called fluorescence, some substances absorb photons of one kind of radiation (e.g) ultraviolet radiation), and give out photons of a different kind (e.g visible light). When infrared radiation falls on these materials, visible light is not

  89. chemistry

    The observation for three materials shows: Material A absorbs all the visible light (opaque) Material B is transparent to all the visible light (transparent) Material C absorbs blue light but is transparent to red light. (Blue light has wavelength 0.4 m,

  90. Math

    The observation for three materials shows: Material A absorbs all the visible light (opaque) Material B is transparent to all the visible light (transparent) Material C absorbs blue light but is transparent to red light. (Blue light has wavelength 0.4 m,

  91. chemistry

    The observation for three materials shows: Material A absorbs all the visible light (opaque) Material B is transparent to all the visible light (transparent) Material C absorbs blue light but is transparent to red light. (Blue light has wavelength 0.4 m,

  92. physics

    The observation for three materials shows: Material A absorbs all the visible light (opaque) Material B is transparent to all the visible light (transparent) Material C absorbs blue light but is transparent to red light. (Blue light has wavelength 0.4 m,

  93. Physics

    A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 81.0°. The index of refraction of quartz is 1.455 at 660 nm (red light), and its index of refraction is 1.468 at 410 nm (violet light). Find the

  94. Astrobiology

    What is the Wow! signal? A) A UV signal, recorded by the International Ultraviolet Explorer in 1975 B) A strong narrow-band radio signal, detected by the Big Ear radio telescope in 1977 C) A ultraviolet light beam, captured by the Hubble Space Telescope in

  95. PHYSICS

    Imagine a soap film (air-soapy water-air) of 1 l,m thickness, and refractive index of 1.5 with white light normal to the film. Which wavelengths in the optical range (400 nm to 700 nm) will appear brightest?

  96. physics

    A laundry detergent contains a three-level quantum system ("whitener") which absorbs ultraviolet light at 273 nm. It emits light at 597 nm as part of a two-step process . What is the wavelength of the second emission process?

  97. quick physics question

    Which has more energy, a photon of ultraviolet radiation or a photon of yellow light? A photon of ultraviolet radiation

  98. Physics

    Typically satellites orbit around 400 above the surface of the earth. If an astronaut weighs 600 on the ground, what will he weigh if he is 400 above the surface?

  99. biochemistry

    ) Anthranilate fluoresces blue under ultraviolet light. Under normal conditions, the levels of anthranilate in bacterial cells are low and the cells do not visibly fluoresce. However, if anthranilate accumulates because a relevant enzyme is defective or

  100. design

    Zigzag machines are divided into two categories?

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