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Q.

The energy of a photon of light of wavelength 450 nm is:

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a

4.4×10−19

b

2.5×10−19

c

1.25×10−17

d

2.5×10−17

answer is A.

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Detailed Solution

Eph=1240λ( in nm)eV=1240450×1.6×10−19=4.41×10−19J
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