First slide

Bohr's atom model

Question

When an electron jumps from $n_{1} t h$ orbit to $n_{2} t h$ orbit, the energy radiated is given by

Easy

A

$h v = E_{1} / E_{2}$
B

$h v = E_{2} / E_{1}$
C

$h v = E_{1} - E_{2}$
D

$h v = E_{2} - E_{1}$

Solution

This is Bohr's Postulate. The energy of emitted photon is difference of the total energies of the two involved orbits.
Hence, as per question, $n_{1} t h$ is higher orbit.
Therefore, $h v = E_{1} - E_{2}$

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