Monochromatic radiation emitted when electron on hydrogen atom ju… - Vidyadip

MCQ

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be $3.57 \;V$. The threshold frequency of the material is .........$ \times 10^{15}\; Hz$

A
$2.5$
✓
$1.6$
C
$4$
D
$5$

✓

Answer

Correct option: B.

$1.6$

b
Energy released from emmition of electron is $E =(-3.4)-(-13.6)=10.2 eV$.

From photo-electric equation, work function $\phi= E - eV = h v _0$

On Solving this $v _0=1.6 \times 10^{15} Hz$

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