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An electron revolves round a nucleus of atomic number Z. if 32.4 eV of energy is required to excite an electron from the n=3 state to n=4 state, then the value of Z is

A

5

B

6

C

4

D

7

Text Solution

Verified by Experts

The correct Answer is:
D
`E_4 - E_3 = 32.4`
`:. (-13.6(Z))^2/((4))^2 + (13.6(Z))^2/(3)^2 = 32.4`
Solving we get
Z =7.
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