Chemistry

posted by .

One type of sunburn occurs on exposure to UV light wavelength in the vicinity of 325nm.
How many photons are in 1.00 mJ burst of this radiation?

  • Chemistry -

    E = hc/lambda
    h = Planck's constant = 6.626 x 10^-34 J*s.
    c is speed of light = 3 x 10^8 m/s.
    lambda is 325 nm. Put this in meters.
    E = Joules for 1 photon = xx.
    Then (xxJ/1 photon) = (1.00 mJ/?)
    Solve for ?. Be sure and put 1.00 mJ in as J.

  • Chemistry -

    1.64*10^15

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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, …
  2. Chemistry

    Radiation in the ultraviolet region of the electromagnetic spectrum is quite energetic. It is this radiation that causes dyes to fade and your skin to develop a sunburn. If you are bombarded with 1.00 mol of photons with a wavelength …
  3. Chemistry!

    a microwave oven uses electromagnetic radiation with a wavelength of 3.00x10^6 nm. calculate energy (in joules) of 1.65 moles of photons of this radiation.
  4. Chemistry

    A particular microwave oven delivers 800 watts. (A watt is a unit of power, which is the joules of energy delivered, or used, per second.) If the oven uses microwave radiation of wavelength 12.2 cm, how many photons of this radiation …
  5. 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 energy …
  6. Chemistry - Photons

    Water is exposed to infrared radiation of wavelength 2.5×10−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons will be required to raise the temperature of 2.5 g of water by 2.5 K?
  7. Chemistry - Photons

    Water is exposed to infrared radiation of wavelength 2.5×10−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons will be required to raise the temperature of 2.5 g of water by 2.5 K?
  8. Chemistry- Dr. Bob

    Question 1 Calculate the wavelength (in nm) of the red light emitted by a neon sign with a frequency of 4.74 x 1014 Hz. A) 704 nm B) 158 nm C) 466 nm D) 633 nm E) 142 nm My answer: D.633 nm Question 2 How many photons are contained …
  9. chemistry

    Determine the number of photons: A certain photon detector receives a signal of total energy 4.05*10^18 Joules from radiation of wavelength 535.00nm. (The only equation I can think to use is E(energy)= 6.63*10^-34 * (C(speed of light) …
  10. science

    3×10^18 photons of a certain light radiation are found to produce 1.5 j of energy. calculate the wavelength of light radiation

More Similar Questions