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Question

The ratio of energy of a photon of radiation of wavelength 2500 A to that of a radiation of wavelength 7500 A is:

A
9
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B
3
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C
7.5
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D
2.5
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Solution

The correct option is B 3
From Planck's quantum theory,

E=hcλ
Given ,
λ1=2500 A and λ2=7500 A
E1λ
E1E2=(λ2λ1)
E1E2=(75002500)=3

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