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Q.

Any radiation in the ultra violet region of Hydrogen spectrum is able to eject photo-electrons from a metal. Then the maximum value of threshold wave length is λ=1R=911A0 then the frequency of the metal is, nearly

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a

2.5 × 1015 HZ

b

4.6 × 1014 HZ

c

8.2 × 1014 HZ

d

3.3 × 1015 HZ

answer is A.

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Detailed Solution

c=vλ⇒v=cλ; ∴v=3×108911×10−10∴v=3.3×1015 Hz

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