Ask Question
16 April, 10:08

What is the longest wavelength of light that will emit electrons from a metal whose work function is?

+3
Answers (1)
  1. 16 April, 10:11
    0
    Best Answer: hf = work function + KE

    However if you are looking at the max wavelength (or threshold frequency) then there will only be just enough energy for the photoelectrons to be liberated, hence their KE will be 0.

    So hf = work function

    convert eV to joules, 2.4 x (1.6 x 10^-19) = 3.84 x 10^-19

    therefore, hf = 3.84 x 10^-19

    f = 3.84 x 10^-19 / planck's constant which is 6.63 x 10^-34

    f = 5.79 x 10^14 Hz

    c = frequency x wavelength,

    wavelength = speed of light/frequency

    = (3x10^8) / (5.79x10^14)

    =5.18 x 10^-7 metres
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “What is the longest wavelength of light that will emit electrons from a metal whose work function is? ...” in 📗 Physics 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