calculate the longest wavelength visible to the human eye

37,604 results
  1. physics

    (a) Calculate the wavelengths in air at 20 C for sounds in the maximum range of human hearing, 20 Hz to 20,000 Hz. (b) What is the wavelength of a 10-MHz ultrasonic wave?

  2. Chemistry

    A metal foil has a threshold frequency of 5.45 x 10^14 Hz. Which color of visible light will not eject electrons from this metal? a) blue b) indigo c) violet d) orange c=(wavelength)(v) 3.0x10^8m/s = (wavelength)(5.45 x 10^14 Hz) 550 nm -> releases green.

  3. 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

  4. Physics

    GIVEN: A monochromatic laser is exciting hydrogen atoms from the n=2 state to the n=5 state. A: What is the wavelength of the laser? *435 nm B: Eventually, all of the excited hydrogen atoms will emit photons until they fall back to the ground state. How

  5. Chemistry

    a) A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg? b) For potassium metal, the work function W (the minimum energy needed to eject an electron from the metal surface) is 3.68 ×

  6. physics

    In a double-slit experiment, it is found that blue light of wavelength 460 nm gives a second-order maximum at a certain location on the screen. What wavelength of visible light would have a minimum at the same location?

  7. Chemistry

    Electromagnetic radiation with a wavelength of 665 nm appears as orange light to the human eye. The energy of one photon of this light is __________ J.

  8. college chemistry

    CH4 + 2 Cl2--> CH2Cl2 + 2HCl Cl-Cl bond energy: 242 kj/mole 1. Calculate the amount of energy (Joules) needed to break a single Cl-Cl bond. 2. Calculate the longest wavelength of light (meters)that can supply the energy per photon necessary to break the

  9. physical chemistry

    2. The retina of a human eye can detect light when radiant energy incident on it is at least 4.0X10-17 J. For light of 600-nm wavelength, how many photons does this correspond to?

  10. physics

    If a 80 lightbulb emits 4.0 of the input energy as visible light (average wavelength 550 ) uniformly in all directions, estimate how many photons per second of visible light will strike the pupil (4.0 diameter) of the eye of an observer 3.0 away. 1. I

  11. Biology

    If everything above 50% of light energy reflected is visible to the human eye, is red light part of the mixture of colors seen in light reflected by chlorophyll? Explain your answer.

  12. Chemistry Help! (Rydberg Equation)

    a) According to the Rydberg equation, the line with the shortest wavelength in the emission spectrum of atomic hydrogen is predicted to lie at a wavelength (in nm) of _____ b) According to the Rydberg equation, the longest wavelength (in nm) in the series

  13. 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?

  14. CHEMISTRY

    4. The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0 x 10-17 J of energy to trigger a series of impulses that eventually reach the brain. (a) How many photons of red light (700.0 nm) are needed? (b) How

  15. Sociology

    Give an example of a human behavior that is considered deviant in one society but is not considered deviant in others. What are the factors that have contributed to this society's perspective of the deviant behavior? The human behavior I wanted to use is

  16. Pyshics

    The wavelength of light visible to the human eye is on the order of 6x10^-7 m. Find the frequency of the light wave if the speed of light in air is 2.99792x10^8m/s. Answer in s^-1

  17. Atomic physics

    1)What is the longest wavelength light capable of ionizing a hydrogen atom in the n = 6 state 2)a. Calculate the energy of the electron in the ground state of single ionized helium, which has an atomic number Z = 2. b. Calculate the radius of its

  18. GenChemistry

    Exposure to high doses of microwaves can cause tissue damage. Estimate how many photons with a wavelength = 12cm, must be absorbed to raise the temperature of your eye by 3.0 deg C. Assume the mass of the eye is 11g and its specific heat is 4.0 J/gK

  19. Chemistry

    The lines in the visible portion of the hydrogen spectrum are called the Balmer series, for which m=2 in the Rydberg equation. Calculate the wavelength in nanometers of the spectral line in this series for which n=4.

  20. science

    Which statement best describes the purpose of the eye?(1 point) The eye lets in varying amounts of light. The eye sends images to the brain. The eye takes in and responds to stimuli. my awnser The eye receives and processes visual signals.

  21. Physics HELP!!

    1. What is the longest wavelength for standing sound waves in a 133.9cm long tube that is open at both ends? b).What is the second longest wavelength? c).What is the third longest wavelength? d).What is the longest wavelength for a standing wave, in the

  22. 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?

  23. 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

  24. Chemistry

    Calculate the longest wavelength of light that can break a H-O bond. The bond enthalpy of formation is 463 kj/mol

  25. Psychology

    From your perspective, how does the material in your textbook on the topics of self-presentation and social perception relate to the passage from Matthew 7:3-5, in which Jesus asks: "Why do you look at the speck of sawdust in your brother's eye and pay no

  26. Physics

    What is the longest wavelength for standing sound waves in a 108.0 cm long tube that is open at both ends? What is the second longest wavelength? What is the third longest wavelength?

  27. Science/Math

    1.What is the maximum resolution of your eyes (assume the wavelength range that your eyes are sensitive to is 300 – 700 nm and that your iris is ½ cm in diameter. 2.What size eye would be required to see in the radio with the same maximum resolution of

  28. gen physics II optics

    Find the radius of a star image formed on the retina of the eye if the aperture (pupil) diameter at night is 0.70 cm and the length of the eye is 3.1 cm. Assume the wavelength of the starlight in the eye is 500 nm. (1nm=10^9 m)

  29. Physics

    1)Put the types of radiation of the electromagnetic spectrum in order from: a)longest to shortest wavelength b)greatest to lowest energy c)slowest to fastest speed A)radio,microwave,infrared,light,x-rays,gamma rays

  30. Chemistry

    If a wave has a wavelength of 467 nm, what type electromagnetic radiation was measured?​ infrared radiation red on the visible light spectrum ultraviolet radiation indigo on the visible light spectrum A?

  31. chem

    The minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164kJ/mol. Calculate the longest wavelenght visible to the human eye

  32. Biology

    Human vision can distinguish objects down to about a 4th of a millimeter (~250 micrometers). Given this, which of the following are generally visible to the human eye? Proteins Bacterial cell Animal cell Poxvirus Ribosomes Plant cell None of the above I

  33. Chemistry (Electrons in Atoms)

    The wavelength of visible light varies from 0.40 μm to 0.70 μm as the color of the light changes from violet to red. Calculate the energy of a photon whose wavelength is 0.67 μm HINT: From the wavelength and the speed of light, we can get the frequency.

  34. *physics*

    Electrons accelerated by a potential difference of 12.87 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. I don't know what equation to use. Any help would be

  35. 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

  36. physics

    light is an electromagnetic wave and travels at a speed of 3.00 x 108 m/s. the human eye is most sensitive to yellow-green light which has a wavelength of 5.45 x 10-7 m. what is the frequency of this light?

  37. Atomic physics

    5)a. Electrons accelerated by a potential difference of 12.23 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. b. Calculate the wavelength of light emitted with the

  38. College Chemistry

    I have no idea how to do this problem, and I've been searching through my book for an hour. Help please? An energy of 2.0x10^2 kJ/mol is required to cause a cesium atom on a metal surface to lose an electron. Calculate the longest possible wavelength of

  39. Physics

    Visible light is incident perpendicularly on a diffraction grating of 200 rulings/mm. What are the (a) longest, (b) second longest, and (c) third longest wavelengths that can be associated with an intensity maximum at theta=30 degrees?

  40. Chemistry

    The ionization energy of hydrogen is 1313 kJ/mol. Covert this energy to: wavelength (nm) 1/wavelength, reciprocal wavelength (cm^-1) spectral region? (IR, visible, UV, etc.) I know E=hv=hc/wavelength h=6.62 x 10^-34 J-s c= 3x10^8 v=c/wavelength But for

  41. chemistry

    A tube containing hydrogen atoms in the n=3 shell does not absorb visible light. The longest wavelength absorbed is 1875 nm. What state is the hydrogen atom in after absorbing a 1875 nm photon?

  42. 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

  43. English

    Which sentence contains repetitious words that should be left out? A. The bright star is visible to the eye. B. The star was visible centuries ago. C. The bright star is visible. D. The star will soon disappear.

  44. Honors Chemistry

    At what wavelengths do Cr(III) ions absorb the maximum amounts of light? Look at your color wheel. What color is Cr(III)? It will absorb the complement of its color. You may have a graph of absorbance vs wavelength for Cr(III). If so, the maximum

  45. chemistry

    Calculate the shortest wavelength of visible light (in nanometers) seen in the spectrum of the hydrogen atom. nm What are the principle quantum numbers for the levels in this transition?

  46. chemistry

    the retina of a human eye can detect light when radiant energy incident on it is at least 4.0x10^-17 J. For light that is 565 nm wavelength, how many phontons does this energy correspond to?

  47. Chemistry

    Which electron transition in a hydrogen atom will emit a photon with the longest wavelength? n = 2 to n = 1 n = 3 to n = 1 n = 1 to n = 2 n = 1 to n = 3 I would assume it would be a short electron transition since energy and wavelength are inversely

  48. Science

    in a true solution, the dissolved particles (1)are visible to the eye (2)will settle out on standing (3)are always solids (4)cannot be removed by filtration

  49. physics

    The third longest wavelength in the Paschen series in hydrogen corresponds to what transitions?

  50. Chemistry

    The hydrogen atomic emission spectrum includes a UV line with a wavelength of 92.3 nm. Is this line associated with a transition between different excited states or between an excited state and the ground state? What is the value of n1 of this transition?

  51. english

    2.Which sentence uses correct parallel construction? A. The painter wore glasses, gloves, and boots. B. Most people enjoy ice cream and the plant grows. C. You can either talk to the manager about your problem or writing a letter to the president of the

  52. chem

    calculate the longest wavelength visible to the human eye

  53. Physics

    Assume that the maximum aperture of the human eye, D, is approximately 8 mm and the average wavelength of visible light, λ, is 5.5 x 10-4 mm. a. Calculate the diffraction limit of the human eye in visible light. D = 8 mm = 0.008 m λ = 5.5 x 10-4 mm = 5.5

  54. Physics

    Assume that the maximum aperture of the human eye, D, is approximately 8 mm and the average wavelength of visible light, λ, is 5.5 x 10-4 mm. a. Calculate the diffraction limit of the human eye in visible light. D = 8 mm = 0.008 m λ = 5.5 x 10-4 mm = 5.5

  55. Science

    What does it mean, when it says "for visible light (ROYGBIV) which has the shortest wavelength? which has the longest? place all other colors in order based on their wavelength from shortest to longest.

  56. Astronomy

    The coolest star whose peak blackbody wavelength can be observed with the human eye (the exact range of visible light varies from publication to publication, so use 380nm to 750 nm).

  57. physics

    5)a. Electrons accelerated by a potential difference of 12.23 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. b. Calculate the wavelength of light emitted with the

  58. physics

    The range of human hearing is roughly from twenty hertz to twenty kilohertz. Based on these limits and a value of 350 m/s for the speed of sound, what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their

  59. 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

  60. 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

  61. chemistry

    The human eye responds to a light stimulus (generates a sensation of "light") upon receiving light energy of 10eV (and more). If we take 6000 angstroms as the average wavelength, how many photons must the eye receive to register a light sensation?

  62. 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

  63. Physics

    The peak wavelength and observed color of a 50,000 K star is 58nm and too blue to see with the human eye. True or False.

  64. 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

  65. physics

    The human eye is sensitive to electromagenetic waves that have wavelengths in the range from 400nm to 700nm (1nm=10^-9m). What range of the frequencies of electromagentic radiation can the eye detect? Can you please show me the steps and work because i

  66. Chemistry

    Calculate the longest wavelength that a line in the Balmer series could have.

  67. chem

    calculate the wavelength of the green line in the visible spectrum of excited H atoms using Bohr Theory

  68. Physics

    Light is an electromagnetic wave and travels at a speed of 3.00 108 m/s. The human eye is most sensitive to yellow-green light, which has a wavelength of 5.58 10-7 m. What is the frequency of this light? Ever heard of the equation (wavelength) x

  69. physics II

    the lens to retina distance in the human eye averages 2.0cm what is the power of the lens of the human eye

  70. 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,

  71. 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,

  72. 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,

  73. 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,

  74. Chemistry

    A store owner would like to install a red illuminated sign. However, when she goes to purchase the sign, the list only includes the types of gases used, rather than the colors they produce. Which gas (H, Kr, He, Ne, Xe, or Ar) would you suggest she buy? In

  75. physics

    Light is an electromagnetic wave and travels at a speed of 3.00 × 10^8 m/s. The human eye is most sensitive to yellow-green light, which has a wavelength of 5.72 × 10^-7 m. What is the frequency of this light?

  76. 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

  77. Physics

    a) Why do you think our eyes fail to see object clearly at varous distances? b) (i) Explain how image of an object is formed in the human eye (ii) What are ciliary muscles? Explain the function of these muscles c) Discuss the similarities and differences

  78. Chemistry

    The retina of a human eye can detect light when radiant energy incident on it is at least 4.0x10^(-17)J. For light of 535nm (5.35x10^(-7) m) wavelength, how many PHOTONS does this energy correspond to?

  79. physics

    Assume that the dots in the painting are separated by 1.0 mm and that the wavelength of the light is vacuum= 500 nm. Find the distance at which the dots can just be resolved by (a) the eye and (b) the camera. I know that the resolving equation is

  80. science

    Compare the light gathering power of a telescope with a 10-centimeter(about 4-inch) diameter mirror to that of the human eye. (Take a diameter of the pupil of the eye to be about 5 millimeters)

  81. Physics

    In which region of the electromagnetic spectrum do we find the energy to fully ionize hydrogen? A) Radio B) Infrared C) Visible D) Ultra-violet E) X-ray I want to know how you would go about doing this question; I know we need to find the wavelength, but

  82. college-- chemistry

    This problem really bugs me and I did figure out the diagram but I cannot figure out the wavelength. Please help me with this problem. The transitions of i) n=2 to n=4 ii) n=3 to n=1 iii)n=5 to n=2 iv) n=3 to n=4 which corresponds to emission of radiation

  83. Chemistry

    If DeltaH for the reaction I2 (s) Delta 2I (g) is 153 kJ/mol. What is the longest wavelength of light that can break an I – I bond? In other words, what is the minimum energy, expressed in terms of wavelength, required to break one I – I bond?

  84. Chemistry

    If H for the reaction I2 (s)  2I (g) is 153 kJ/mol. What is the longest wavelength of light that can break an I – I bond? In other words, what is the minimum energy, expressed in terms of wavelength, required to break one I – I bond? A. 246 nm B.

  85. Quantum Physics

    How is it a substance can emit photons of visible light after absorbing ultra violet photons but not with infrared radiation The re-emitted photons must be of lessor energy (longer wavelength) than the incident photons. In a one-photon absorption process,

  86. 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,

  87. 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,

  88. 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

  89. Physics

    In daylight, the diameter of the iris is about 3 mm. PART A What is the angle between two distant point objects that can just be resolved? Assume the light's wavelength in air is 600 nm and the index of refraction inside the eye is 1.33. PART B What is the

  90. Science

    Explain the relationship between visible light spectra and wavelength.

  91. Physics

    What is the energy (in eV ) of a photon of visible light that has a wavelength of 500 nm ?

  92. Chemistry

    a) Name the colors of visible light (the colors of the rainbow) in order of increasing energy. Indicate the approximate wavelength associated with each color. b) When excited, elemental sodium gives off a distinctive color that is used often in street

  93. PHYSICS

    What is the longest wavelength that can be heard by a normal ear?

  94. physics

    What is the longest wavelength that can be heard by a normal ear?

  95. Chemistry

    Chlorofluorocarbons (CFC's) are organic compounds that have been implicated in ozone depletion. When the CFC known as Freon 12 (CCl2F2) is exposed to UV radiation (wavelength in the range of 10 nm to 400 nm, a bit shorter than visible light), a chlorine

  96. Physics

    What is the wavelength of visible light emit- ted at 4.2 × 108 MHz?

  97. English

    The Eleveven cities tour is the longest speed skating race. --------------------- What does 'lonngest' mean? Does it mean the longest length or the longest time?

  98. science

    Whar are two longest wavelength in frequency 1kghz and 200kghz

  99. Physics

    What is the wavelength of visible light of 6 x 1014 Hz frequency? 500 nm 400 nm 4000 nm 4 nm

  100. Chemistry

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

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