Any radiation in the ultra violet region of Hydrogen spectrum is able to eject photoelectrons from a metal. Then the threshold frequency of the metal for a threshold λ=1R=911˙A,is nearly
A
3.3×1015HZ
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B
2.5×1015HZ
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C
4.6×1014HZ
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D
8.2×1014HZ
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Solution
The correct option is A3.3×1015HZ c=νλ ; ν=cλ=3×108911×10−10 ν=3.3×1015HZ