Ask Question
13 November, 16:58

A laser pulse with wavelength 555 nm contains 4.40 mj of energy. how many photons are in the laser pulse?

+1
Answers (1)
  1. 13 November, 17:03
    0
    Wavelength is the ratio of speed of light and frequency:

    wavelength = speed of light / frequency

    where frequency is: (c is speed of light)

    freq = c / wavelength = 3E8/550E-9 = 5.45E14 Hz

    We know that photons have energy E = hf = 6.626E-34 Js * 5.45E14 Hz = 3.61 E-19 J

    Therefore if it has 4.40 mJ of energy, the pulse has:

    4.40E-3/3.61E-19 = 1.22E16 photons
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “A laser pulse with wavelength 555 nm contains 4.40 mj of energy. how many photons are in the laser pulse? ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers