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Q.

An electron in hydrogen and one in a singly ionised helium atom are excited to the state n = 2. A photon is emitted when these electrons iump back to the ground state in each case. Then

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a

energy of photon is same in both

b

radiations emitted by helium atom are shifted towards the red as compared to radiation from hydrogen atom

c

radiation emitted by helium are shifted towards the violet as compared to radiation from hydrogen atom

d

there is no definite relation between the radiations emitted by the two atoms

answer is C.

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Detailed Solution

we know that v∝Z2Hence the corresponding lines from helium are more energetic (shifted toward the violet) compared to those from hydrogen,
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An electron in hydrogen and one in a singly ionised helium atom are excited to the state n = 2. A photon is emitted when these electrons iump back to the ground state in each case. Then