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

Easy

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

Solution

we know that ${v∝Z}^{2}$ Hence the corresponding lines from helium are more energetic (shifted toward the violet) compared to those from hydrogen,

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