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Q.

A hydrogen atom is in the 4th excited state, then

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a

the maximum number of emitted photons will be 10

b

the maximum number of emitted photons will be 6

c

it can emit three photons in ultraviolet region

d

if an infrared photon is generated, then a visible photon may follow this infrared photon

answer is D.

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Detailed Solution

The hydrogen atom is in n = 5 state.∴Max. no of Possible Photons = 4To emit photon in ultra violet region, it must jump to n = 1, because only Lyman series lies in u.v. region. Once it jumps to n = I photon, it reaches to its ground state and no more photons can be emitted. So only one photon in UV range can be emitted.
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