Q.
How many photons of light having wavelength 6626 Å are equivalent to 1.5 J?
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a
2.5 × 1016
b
5 × 1020
c
1.5 × 1018
d
5 × 1018
answer is D.
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Detailed Solution
E=xhcλ1.5=x×6.626×10−34×3×1086626×10−10 x=5×1018
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