Question

photoelectric effect problem: work function for particular metal given what wavelength could cause the photo electrons to be released from sodium. Make up a problem with made up values and solve show all equations used to solve

Answer 1

Let on material Sodium has Work Funtion = 2.28 eV ,Find the wavelenth of the incident Light which is resposible for emission of photo electrons.

Sollution:

SO energy of photon = WOrk function

h * f = W_o [Here h = planks constant and f = frequency and Wo = workfunction]

So f = W_o / h = 2.28 eV / 6.63 * 10^-34 = (2.28 * 1.6 *10^{-19 )} / 6.63 * 10^-34 = 5.50 * 10¹⁴ Hz

So frequency of Incident Light = 5.50 * 10¹⁴ Hz

Now as se know that Speed of light (c) = Wavelenth * frequency

So wavelength = c/f = 3 * 10 ⁸ /5.50 * 10^{14 =} 5.45 *10 ^-7 = 534 nm

SO wavelength of Light = 534 nm