MCQ
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
  • Statement $I$ is incorrect but statement $II$ is true

Answer

Correct option: D.
Statement $I$ is incorrect but statement $II$ is true
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.

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