Question

The energy required to transfer an electron from second Bohr's orbit to third Bohr's orbit in a hydrogen-like atom with nuclear charge $Z_e$ is $68.eV$. The value of Z will be.

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is D 6

$68=13.6\times Z^2(\frac{1}{2^2}-\frac{1}{3^2})$
$68=13.6\times Z^2\times \frac{5}{36}$
$Z=6$