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Q.

The following diagram indicates the energy levels of a certain atom when the  electron  moves from 4E level to E. A photon of wavelength λ1is emitted. The wavelength of photon produced during its transition from 73E level to E is λ2. The ratio λ1λ2 will be

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a

94

b

49

c

32

d

73

answer is B.

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Detailed Solution

Transition from 4E to E (4E−E)=hcλ1 ⇒λ1=hc3E.........(i)  Transition from 73E to E 73E−E=hcλ2 ⇒λ2=3hc4E.........(ii)  From equations (i) and (ii):  ⇒λ1λ2=49
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The following diagram indicates the energy levels of a certain atom when the  electron  moves from 4E level to E. A photon of wavelength λ1is emitted. The wavelength of photon produced during its transition from 73E level to E is λ2. The ratio λ1λ2 will be