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Q.

The wave number of the radiation whose quantum is 1 erg is

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a

5×1015cm−1

b

15×105cm−1

c

1.5×1015cm−1

d

5×105cm−1

answer is D.

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Detailed Solution

ϑ=? cm−1 E=1 erg E=hcϑ¯ ⇒ϑ¯=Ehc =16.6×10−27×3×1010cm−1 =10162 =5×1015 cm−1

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