K max ( in e V ) = 3 , and frequency of light (in H z ) = 1 × 10 15 for a metal used as a cathode in a photoelectric experiment. The threshold frequency of light for the photoelectric emission from the metal is -

Question

K max ( in e V ) = 3 , and frequency of light (in H z ) = 1 × 10 15 for a metal used as a cathode in a photoelectric experiment. The threshold frequency of light for the photoelectric emission from the metal is -, 1 × 10 14 Hz, 1.5 × 10 14 Hz, 2.1 × 10 14 Hz, 2.7 × 10 14 Hz

MARKS App · Accepted Answer

Given, K max = 3 eV h = 4.125 × 10 − 15 eV Hz -1 h ν = K max + W 4.125 × 10 - 15 × 10 15 = 3 + W or 4.125 = 3 + W or W = 1.125 The threshold frequency ν 0 = W h ν 0 = 1.125 4.125 × 10 − 15 ν 0 = 1.125 × 10 − 15 4.125 ν 0 = 2.72 × 10 14

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