Published by:
CGP EDU Academic Team
Published on: August 14, 2026
A metal surface is exposed to 500nm radiation. The threshold frequency of the metal for photoelectric currentis 4.3 × 10 14 Hz. The velocity of ejected electron is ____ ×10 5 ms −1 (Nearest integer)
[Use :h = 6.63 × 10 −34 Js,m e = 9.0 × 10 −31 kg]
Text Solution
Verified by ExpertsThe correct answer is:
5
(5)
v: speed of electron having max. K.E
⇒ from Einstein equation : E = ϕ + K.E ⋅ max
⇒ 
⇒ 
⇒ 
⇒ v = 5 × 10 5 m/sec
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