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
Options:
A. 3.3×1015HZ
B. 2.5×1015HZ
C. 4.6×1014HZ
D. 8.2×1014HZ

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Answer: Option A
: A

c=νλ ; ν=cλ=3×108911×1010
ν=3.3×1015HZ

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