Monochromatic light from a discharge tube containing dilute gas of hydrogen atoms falls on platinum metal which has a work function of 5.65 eV . The energy of the fastest photoelectrons is 6.45 eV . This corresponds to

• Correct answer
  A

  the change in the angular momentum of the H atom is of magnitude $\frac{h}{\pi}$.
• B

  the electronic transiton from the state $n=2$ to $n=1$.
• C

  the electronic transition from the state $n=5$ to $n=2$.
• D

  the change in the angular momentum of the H atom is of magnitude $\frac{h}{2 \pi}$.

Hence, the correct answer is option: 'A'.