A surface irradiated with light \( \lambda=480 \mathrm{~nm} \) gives out electrons with maximum ....

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A surface irradiated with light \( \lambda=480 \mathrm{~nm} \) gives out
\( \mathrm{P} \)
electrons with maximum velocity \( v \mathrm{~m} / \mathrm{s} \), the cut off wavelength being \( 600 \mathrm{~nm} \). The same surface would release electrons with maximum velocity \( 2 v \mathrm{~m} / \mathrm{s} \) if it is irradiated by light of wavelength:
(1) \( 325 \mathrm{~nm} \)
(2) \( 360 \mathrm{~nm} \)
(3) \( 384 \mathrm{~nm} \)
(4) \( 300 \mathrm{~nm} \)


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