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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