Question

Given below are two statements:
Statement I : In hydrogen atom, the frequency of radiation emitted when an electron jumps from lower energy orbit $\left( E _{1}\right)$ to higher energy orbit $\left( E _{2}\right)$, is given as $hf = E _{1}- E _{2}$.
Statement-II : The jumping of electron from higher energy orbit $\left( E _{2}\right)$ to lower energy orbit $\left( E _{1}\right)$ is associated with frequency of radiation given as $f$ $=\left( E _{2}- E _{1}\right) / h$
This condition is Bohr's frequency condition. In the light of the above statements, choose the correct answer from the options given below:

• A. Both statement I and statement II are true.
• B. Both statement I and statement II are false
• C. Statement I is correct but statement II is false
• D. Statement I is incorrect but statement II is true.

Answer 1

Answer: (D)

When electron jump from lower to higher energy level, energy absorbed so statement-I incorrect. When electron jump from higher to lower energy level, energy of emitted photon
$E = E _{2}- E _{1}$
$hf = E _{2}- E _{1}$
$ \Rightarrow f =\frac{ E _{2}- E _{1}}{ h }$
so statement-II is correct.