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Asked by Rahul Last Modified
Answer 
Harshit Bhardwaj
Wavelength of ultraviolet light, λ = 2271 Å = 2271 × 10−10 m
Stopping potential of the metal, V0 = 1.3 V
Planck’s constant, h = 6.6 × 10−34 J
Charge on an electron, e = 1.6 × 10−19 C
Work function of the metal = 
Frequency of light = ν
We have the photo-energy relation from the photoelectric effect as:
= hν − eV0
Let ν0 be the threshold frequency of the metal.
∴= hν0
Wavelength of red light, 
= 6328 × 10−10 m
∴Frequency of red light, 
Since ν0> νr, the photocell will not respond to the red light produced by the laser.
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