How is light emitted from incandescent lamps? Fluorescent lamps? Candles?

7,539 results
  1. English

    Choose the answer that best matches the word in italics. One way to save money on electricity is to replace incandescent bulbs with compact fluorescent (CF) light bulbs. A.) outside visible spectrum B.) creating light by radiating heat* C.) emitting light

  2. Physics

    The typical resistance of the tungsten filament of a 60 watt incandescent light bulb when it is turned off is 24 ohms and its resistance when operating from a 120 volt power source is 240 ohms. Generally, an incandescent light bulb filament is most likely

  3. An Inconvenient Truth

    5. In An Inconvenient Truth, the author uses which of the following to emphasize how humans can improve the atmosphere? a. the opening of "A Silent Alarm" b. the opening of "What exactly are greenhouse gases" c. the opening of "Crisis=Opportunity"*** d.

  4. 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

  5. math

    If 5 tramps, can fix 5 lamps in 5 minutes, the number of minutes it takes 8 tramps to fix 16 lamps is

  6. English

    Which of the following statements in a research paper would need citation? A. Washington, D.C. is the capital of the United States. B. The landing on the moon is one of the most exciting events in recent history.*** C. Volcanologists agree that eruptions

  7. Algebra

    Two lamps can be connected to a battery in a circuit in series or in parallel. You can calculate the total resistance RT (t is down from r) in a circuit if you know the resistance in each lamp. Resistance is measured in ohms. For a circuit connected in

  8. physics voltage

    If one lamp of a group of five identical lamps in series is removed, the voltage across the empty socket becomes equal to the line voltage, rather than remaining one-fifth of it. Why?

  9. Chemistry

    Sodium vapor lamps, use for public lighting, emits 489 nm yellow light. What energy is emitted by: a) an excited sodium atom when it generates a photon? b) 1 mole of excited sodium atoms at this wavelength?

  10. Science

    A parallel connection of several lamps in a home allow you to control each lamp independently with switches. How is this possible?

  11. English

    Choose the answer that best matches the word "incandescent" One way to save money on electricity is to replace incandescent bulbs with compact fluorescent (CF) light bulbs. a. outside visible spectrum b. creating light by radiating heat c. emitting light

  12. Algebra 1

    Andrea is selling candles as a fundraiser. she spent $50 on supplies for making the candles. she plans to sell the candles for $10 each. her profit can be modeled by c(x)=10x-50. what is the domain and range of the function if she sells up to 8 candles on

  13. business math

    Camille Keegan sells lamps for $105.55 that cost her $75.00. Camille's percent of markup based on the selling price is:

  14. Chemistry

    Describe the spectrum of the light from a fluorescent lamp and from an incandescent (tungsten filament) lamp, and try to explain what you observe. So fluorescent lamps use electricity to excite mercury vapour, and the excited atoms produce short-wave UV

  15. chemistry

    We conduct an experiment by shining 500 nm light on potassium metal. This causes electrons to be emitted from the surface via the photoelectric effect. Now we change our source light to 450 nm at the same intensity level. Which of the following is the

  16. 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

  17. Physics

    A circuit contains six 270 lamps and a 18.0 heater connected in parallel. The voltage across the circuit is 120 V. (a) What is the current in the circuit when four lamps are turned on? (b) What is the current in the circuit when all lamps are on? (c) What

  18. Chemistry

    Sodium vapor lamps are often used in residential street lighting. They give off yellow light with a frequency of about 5.91 × 1014 Hz. What is this wavelength in nm?

  19. IPC

    Explain whether the photons emitted by a bright light bulb are more energetic than those emitted by a dim light bulb of the same color. how does the color of the light bulb determine the amount of energy of the electromagnetic waves?

  20. science

    A circuit in a home provides power to a light fixture. The homeowners want to use a compact fluorescent bulb instead of an incandescent bulb. Compact fluorescent bulbs can produce as much light as incandescent bulbs but with less energy. How is this

  21. Physics

    A metal surface is struck with light of wavelength 430 nm releasing a stream of electrons. If the 430 nm light is replaced by 380 nm light of the same intensity, what is the result? a. no change to the emitted electrons b. emitted electrons are more

  22. Physics!!

    Green light is emitted when electrons in a substance make a particular energy-level transition. If blue light were instead emitted from the same substance, would it correspond to a greater or lesser change of energy in the atom? and why?

  23. Physics

    A circuit contains sic 60-W lamps with a resistance of 240-ohm each and a 10.0-ohm heater connected in parallel. The voltage across the circuit is 120 V. Find the current in the circuit for the following situations:::: a. four lamps are turned on b. all of

  24. Chemistry

    Based on the spectrum of the fluorescent lamp, what is the main difference between the radiation emitted by a heated solid (filament) and the radiation emitted by an atomic gas (mercury gas in the fluorescent tube)?

  25. Photography

    Which type of light has the most neutral tone? Fluorescent Daylight Incandescent Shade I don’t think it is shade or fluorescent.

  26. chemestry

    Sodium vapour lamps used for public lighting emitting 589 nm yellow light. Calculate the energy emitted by: an excited atom when it generates a photon at this wavelength and calculate the energy emitted by 0.1mol of excited Sodium atom at this wave length?

  27. Finite with Calculus Applications

    The Ball Company manufactures three types of lamps, labeled A,B,and C. Each lamp is processed in two departments, I and II. Total available work-hours per day for departments I and II are 400 and 600, respectively. No additional labor is available. Time

  28. Art

    An interior designer hopes to create a cozy relaxing intimate environment in a restaurant. which lighting choice will best help to accomplish this goal A) overhead fluorescent lights B) energy-saving light bulbs C) red and orange mood lighting•• D)

  29. Physics

    draw a ciruit of 2 lamps in parllel with each other connected to a power source and an ammeter to measure the total current of the circuit and a voltmeter to measure the potential difference across the two lamps

  30. chemistry

    sodium vapor lamps, used for public lighting, emit 489nm yellow light. what energy is emitted by: (a) an excited sodium atom when it generates a photon? (b) 1 mol of excited sodium atoms at this wavelength?

  31. Chemistry

    Before small batteries were available, carbide lamps were used for bicycle lights. Acetylene gas, C2H2, and solid calcium hydroxide were formed by the reaction of calcium carbide, CaC2, with water. The ignition of the acetylene gas provided the light.

  32. math

    You are thinking of making your mansion more energy efficient by replacing some of the light bulbs with compact fluorescent bulbs, and insulating part or all of your exterior walls. Each compact fluorescent light bulb costs $4 and saves you an average of

  33. chem

    A typical fluorescent light bulb contains argon gas and mercury vapor.? a. If the total gas pressure in a fluorescent light bulb is 307.1 Pa and the partial pressure of the argon gas is 306.0 Pa, what is the partial pressure of the mercury vapor? b. If a

  34. Chemistry

    Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. How much energy is emitted by 5.00 mg of sodium atom emitting light at this wavelength?

  35. Sodium Vapor

    How might you distinguish a sodium vapor street lamp from a mercury vapor steet lamp? http://en.wikipedia.org/wiki/Sodium_lamp http://en.wikipedia.org/wiki/Mercury-vapor_lamp I think you would see colors better with the Mercury Vapor Light You can

  36. Art

    An interior designer creates a plan for a baby nursery. Why does he decide to use light blue as a main part of the color scheme? Light blue encourages infant brain development. Light blue is the most popular color for nurseries. Light blue will encourage

  37. Physics

    What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium vapor devices?

  38. Math

    Two lamps are to be chosen from pack of 12 lamps where four are defective and the rest are non defective. what is the probablity that a.both are defective? b.one is defective? c.at most one is defective?

  39. Science please help!

    A lamp connected to a battery lights up. If a second, identical lamp is connected to the battery in parallel, the current drawn from the battery will _____ , and compared to the original brightness of the first lamp, both lamps will be _____ . will the

  40. 8th grade Physics

    Explain whether the photons emitted by a bright light bulb are more energetic than those emitted by a dim light bulb of the same color. How does the color of the light bulbs determine the amount of energy of the electromagnetic waves?

  41. English

    1. There are many fluorescent lights on the ceiling. 2. There are many fluorescent lamps on the ceiling. 3. There are many fluorescent light bulbs on the ceiling. (Which expressions are right? Which one is commonly used? Thank you.)

  42. Physical Sci

    An incandescent light bulb produces light when electrons flow through the (1 point) * air. * glass. * filament. * vacuum. 2. Many streets and parking lots are illuminated with (1 point) * laser lights. * tungsten-halogen lights. * sodium-vapor lights. *

  43. 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

  44. physics

    Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.

  45. Physics

    What gases are in a fluorescent and incandescent bulb?

  46. physics 102

    three lamps connected to a 120-V AC (rms) household supply voltage. Lamps 1 and 2 have 75.0-W bulbs; lamp 3 has a 40.0-W bulb. (a) For each bulb, find the rms current. Irms, lamp 1 = A Irms, lamp 2 = A Irms, lamp 3 = A (b) For each bulb, find the

  47. Physics

    Can a lamp with a broken light bulb produce electromagnetic radiation? and What happens when you have two colored lamps in a dark room. A red one on the left and a green one on the right, and you place your hand in the center of the 2! Would the shadows on

  48. Physics

    A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with

  49. PHOTOGRAPHY

    Which type of light has the most neutral tone? Shade Cloudy Daylight Fluorescent not shade or fluorescent

  50. Algebra 1

    Andrea is selling candles as a fundraiser. she spent $50 on supplies for making the candles. she plans to sell the candles for $10 each. her profit can be modeled by c(x)=10x-50. what is the domain and range of the function if she sells up to 8 candles a

  51. physics

    When a yellow light shines on a photosensitive metal, photoelectrons are emitted. As the intensity of the light is decreased, the number of photoelectrons emitted per second

  52. ipc

    investigate and compare economic and environmental impacts of incandescent light bulbs versus the various fluorescent lamps, solar lamp, and oil burning lamp or candles.

  53. chemistry

    Sodium vapor lamps are used in Chicago to light city streets. The light emitted (given off) by these lamps has a λ of 5.9 x 10-7 m. What is the λ in cm? What is the λ in nanometers (nm) [1 meter = 1 x 109 nm]? What is the ν of this radiation? In what

  54. accounting

    Kam Motor Company manufactures automobiles. During September 2007 the company purchased 5,000 head lamps at a cost of $9 per lamp. Kam withdrew 4,650 lamps from the warehouse during the month. Fifty of these lamps were used to replace the head lamps in

  55. physical science

    Light whose waves all have the same wavelength, direction, and coincidental peaks is called A) coherent light B) incandescent light C) fluorescent light D) neon light I'm not sure but I think maybe B? Please help me thanks so much.

  56. Physics Energy

    How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?

  57. Energy question

    How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?

  58. Chemistry

    Toy ovens made for children often use incandescent light bulbs as a heat source. Incandescent light bulbs are relatively inefficient at generating light. Approximately 95% of the energy they use is emitted as heat instead of light: that's bad for the

  59. science

    Which of the following light bulb types uses the least energy, and therefore results in fewer greenhouse gas emissions? I think it is b.. is that right? a) incandescent b) LED c) compact fluorescent d) halogen

  60. chemistry-check answer

    Suppose you have a 10 watt fluorescent light bulb. If this light bulb is 6 % efficient in turning electricity into light, then how many photons are being emitted per second? Assume that average energy of all the photons emitted is 550 nm, thus you can

  61. physics

    1. Outlets of two rooms are placed in parallel on a single circuit (120 volts). How many 100 watt light bulbs could you run on a circuit that had a 15 amp circuit breaker (max of 15 amps total) need help setting up problem?? Each 100 W lamp draws I = P/V =

  62. 11th grade

    Sodium Vapor lamps emit a characteristic yellow light . What can we deduce about sodium atoms, based on this observation?

  63. Physics

    A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with

  64. science

    A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with

  65. physics

    Which of the following is correct when the intensity of the light source is increased? Choose one answer. a. The number of photons emitted by the light source in unit time increases. b. The total energy of the photons emitted per unit time decreases. c.

  66. Algebra 2 Honors

    The amount of light emitted from a battery indicator bulb pulses while the battery is charging. This can be modeled by the equation y = 60+60sin[(pi/4)t] , where y is the lumens emitted from the bulb and t is the number of seconds since the beginning of a

  67. physics

    Please could someone advise me on answering this question. I need to explain why when infrared radiation falls on fluorescent material no visble light is emitted. Is this something to do with infrared being at the lower energy end of the spectrum? I would

  68. Algebra

    A store ordered 650 candles at a total wholesale cost of $7215.80. They bought some wax candles at $9.94 each and some nicer candles at $12.49 each. How much of each did they buy?

  69. Physical Science

    Which kind of light is used to carry information through optical fibers? A. fluorescent B. sodium-vapor light C. laser

  70. physics

    How is light emitted from incandescent lamps? Fluorescent lamps? Candles?

  71. Accounting

    Sherman's interiors sells lamps. At March 31, the company had 400 sofas in inventory. The company's policy is to maintain a lamp inventory equal to 2% of next month's sales. The company expects the following sales activity for the second quarter of the

  72. physics

    If two lamps with 15 cd and 35 cd are separated by 8.5, at what point would the light produced by both lamps be equal?

  73. Physics

    A circuit contains sic 60-W lamps with a resistance of 240-ohm each and a 10.0-ohm heater connected in parallel. The voltage across the circuit is 120 V. Find the current in the circuit for the following situations:::: a. four lamps are turned on b. all of

  74. Math

    Home Depot sells compact fluorescent lamps (CFLs) that have a mean life of 10,000 hours with a standard deviation of 1,000 hours. In an order of 8,000 lamps, how many can be expected to last 11,000 hours or longer?

  75. Fractions

    The cost of a table lamp was 2/3 the cost of a fan. A coordinator spent 3/5 of his money on 12 table lamps and 2 fans. He then used the rest of his money to buy another 4 fans and some table lamps. (a) If he had spent all his money on the table lamps, how

  76. calculus

    A lamp has a cost function of C(x) = 2500 + 10x, where x is the number of units produced per day and C(x) is in dollars. The revenue function for these lamps is R (X)= 18x−.001x^2. At least 100 lamps and no more than 2000 lamps may be produced per day.

  77. Accounting

    Kam Motor Company manufactures automobiles. During September 2007 the company purchased 5,000 head lamps at a cost of $9 per lamp. Kam withdrew 4,650 lamps from the warehouse during the month. Fifty of these lamps were used to replace the head lamps in

  78. optics in physics

    acorridor is lighted by 4 lamps s10cm apart and suspended at a height of 5m above the centre of the floor. if each lamp gives 200cp in all directions below the horinzontal, find the illumination at the point on the floor mid-way between the second and

  79. pre-calculus

    It has been found that the supply of lamps varies linearly with its price. When the price per item was $ 94.67 ,64 items are supplied; When the price was $ 134.67 , 124 items are supplied. How many lamps are supplied when the price per item is $ 118.00 ?

  80. physics

    A hose contains 20 lamps of 200 W for each lamp and a heater of power 1500 W. they are all connected to supply voltage of 240 volt. Calculate; (a) The total current when all loads operates at the same time. (b) Total energy when 10 lamps and the heater

  81. PHYSICAL SCIENCE QUESTION PLEASE I NEED YOUR HELP!

    What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium-vapor devices? Thank You I really appreciate your help! :3

  82. English

    Q1: What is there in the classroom? Q2: What's there in the classroom? Q3: What is in the classroom? Q4: What are in the classroom? 1. There is an LCD TV in the classroom. 2. There are an English textbook and a pencil case on my desk. 3. There are a lot of

  83. Chemistry

    Sodium Vapor lamps emit a characteristic yellow light . What can we deduce about sodium atoms, based on this observation? Please help!!

  84. Algebra

    Two lamps can be connected to a battery in a circuit in series or in parallel. You can calculate the total resistance RT (t is down from r) in a circuit if you know the resistance in each lamp. Resistance is measured in ohms. For a circuit connected in

  85. Physics

    Why are household lamps are not connected series?

  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. Math

    A whole seller buys plastic lamps for $18 each and sells them for $30.60 What is the percent markup based on cost?

  88. percentages/word problem

    A wholesaler buys plastic lamps for $18 each and sells them for $30.60. What is the percent markup based on cost?

  89. Math 102

    A wholesaler buys plastic lamps for $18 each and sells them for $30.60. What is the percent markup based on cost

  90. Physic

    CFL light bulbs consume less power than their incandescent counterparts while providing about the same amount of light. Suppose a CFL, while consuming only 20 Watts of power produces as much light as a 60 Watt incandescent bulb. Also, suppose a house has 8

  91. Physics

    A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with

  92. physics

    a 75 w light source consumes 75 w of electrical power . assume all this energy goes in to emitted li ght of wavelength 600nm calculate the frequency of the emitted light?

  93. physics

    b. If you are cruising down the road at 50 mph and a policeman with a radar gun (wavelength 1 cm) reflects radar light off your bumper, what wavelength of radar light does he get back? Assume the policeman is stationary, and you are moving towards him.

  94. Science

    Draw two lamps and a battery of 12 volts calculate the current in each lamp and the voltage across each lamp if the resistance are 40 and 60 ohms respectively

  95. Physics

    a. In which case will there be more current in each of three lamps - if they are connected to the same battery in series or in parallel? b. In which case will ther be more voltage across each lamp?

  96. Math

    Mr. Kushner's class is selling candles for a class trip. There are 18 students in his class in all. 3 students sell 5 candles. The number of students who sell 6 candles is 2 more than the number who sell 5 candles. 3 students sell 8 candles. 1 student

  97. maths

    karen decorated her mother's birthday cake. one-third of candles are pink, three-eights are yellow, one-quater are blue and the two remaining candles are white. calculate (a). the fraction of candles that are white. (b). the total number of candles on the

  98. Maths

    karen decorated her mother's birthday cake. one-third of candles are pink, three-eights are yellow, one-quater are blue and the two remaining candles are white. calculate (a). the fraction of candles that are white. (b). the total number of candles on the

  99. Math

    Forty members of a group are making candles. One member drops out and the rest have to make three more candles each to make up. Each member makes the same number of candles. How many candles do they make altogether.

  100. One last L.A. question!

    Identify the independent clause in the following sentence. Before electric lighting was invented, people used candles to light their homes at night. a. Before electric lighting was invented b. people used c. people used candles to light their homes at

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