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Grade: upto college level
        The work function of a metal is 2.5 × 10^-19 J. (a) Find the threshold frequency for photoelectric emission. (b) If the metal is exposed to a light beam of frequency 6.0 × 10^14 Hz, what will be the stopping potential?
5 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
							Sol. W base 0 = 2.5 * 10^–19 J
a) We know W base 0 = hv base 0
v base 0 = W base 0/h = 2.5 * 10^-19/6.63 * 10^-34 = 3.77 * 10^14 Hz = 3.8 * 10^14 Hz
b) eV base 0 = hv – W base 0
or, V base 0 = hv – W base 0/e = 6.63 * 10^-34 * 6 *10^14 – 2.5 *10^-19/1.6 *10^-19 = 0.91 V

						
5 years ago
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