Question

Energy above ground state

$n=4$ ------------------------------ $E_4=7eV$

$n=3$ ------------------------------ $E_3=6eV$

$n=2$ ------------------------------ $E_2=4eV$

$n=1$ ------------------------------ $E_1=0$

In the above figure, energies of different levels are given. Which of the following transitions will produce the photon with the higher frequency?

• A. $n=2ton=1$
• B. $n=3ton=1$
• C. $n=3ton=2$
• D. $n=4ton=1$
• E. $n=4ton=3$

Answer 1

The correct option is D $n=4ton=1$

Photon of a particular energy is emitted when transition takes place from a higher energy level to a lower energy level with difference being the energy of the photon.

Transition for which photon has higher frequency is the one between whose energy levels, difference is maximum.

Since the difference between $n=4$ to $n=1$ is greatest and equal to $7eV$, option D is the answer.