chemistry

How many photons of frequency 2.7*10^14 Hertz would be needed to light a 60 Watt light bulb for 1hr?

  1. 👍 0
  2. 👎 0
  3. 👁 133
asked by regina
  1. 1 watt = 1 J/second.
    60 watts is 60 J/second and that for 1 hour is 60 x (60sec/min) x (60min/hour) = 216,000 J/hour is the energy needed to power the bulb.

    E of photon = Planck's constant x 2.7E14 = ??
    Divide the power needed by the power/photon to find the number of photons. Surprise. It's a huge number.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. 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

    asked by Jazmin on October 31, 2010
  2. chemistry

    Light bulbs emit a broad spectrum of light; that is, they emit photons with a broad range of wavelengths. Suppose that 10% of the photons from a 75-Watt (on watt is one joule per second) bulb are emitted with an average wavelength

    asked by Maria on January 22, 2011
  3. chemistry

    A 100-watt light bulb radiates energy at a rate of 100 J/s. (The watt, a unit of power or energy over time, is defined as 1 J/s.) If all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

    asked by anon yo on October 6, 2016
  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

    asked by A 75- light source consumes 75 of electrical power. Assume all this energy goes into emitted light on October 21, 2011
  5. 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

    asked by J on April 28, 2008
  6. Chemistry

    What is the frequency in hertz of a photon of light with an energy of 3.93 x 10-21J? What is the frequency of light in hertz with a wavelength of 4.12 x 10-7m?

    asked by milo on October 22, 2017
  7. 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

    asked by Sutheshan on February 9, 2014
  8. Astronomy

    Based on what you learned about light, select all of the correct statements from the following list. The only type of electromagnetic radiation that is actually considered light is visible light. High frequency photons carry more

    asked by Andy on November 9, 2011
  9. 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

    asked by Anonymous on May 13, 2010
  10. CHEMISTRY

    If you used only photons that were dropping from the n = 6 shell to the n = 1, how many of these photons would be required to keep a 100 Watt light bulb lit for 10 minutes?

    asked by Jessica on June 13, 2016

More Similar Questions