When a metallic surface is illuminated with light of wavelength \( \lambda \), the stopping pote....

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When a metallic surface is illuminated with light of
\( \mathrm{P} \)
wavelength \( \lambda \), the stopping potential is \( \mathrm{x} \) volt. When the same surface is illuminated by light of
W
wavelength \( 2 \lambda \), the stopping potential is \( \frac{x}{3} \). Threshold wavelength for the metallic surface is
(1) \( \frac{4 \lambda}{3} \)
(2) \( 4 \lambda \)
(3) \( 6 \lambda \)
(4) \( \frac{8 \lambda}{3} \)


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