Question

# photoelectric effect problem: work function for particular metal given what wavelength could cause the photo electrons...

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

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

So f = Wo / 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 * 1014 = 5.45 *10 -7 = 534 nm

SO wavelength of Light = 534 nm

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