Published by:
CGP EDU Academic Team
Published on: September 12, 2026
When light of wavelength 
falls on a metal of threshold energy 
, the de-Broglie wavelength of emitted electrons is_A. [Use : 
Text Solution
Verified by ExpertsThe correct answer is:
9
(9) Incident energy of photon
Work function of metal + K.E. of photoelectron
Incident energy of photon
Now using equation (i),
.
For de-broglie wavelength 
;
so 
Then, 
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