Photoelectric EffectHard
Question
Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to theground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. Thethreshold frequency of the material is
Options
A.2.5 × 1015 Hz
B.4 × 1015 Hz
C.5 × 1015 Hz
D.1.6 × 1015 Hz
Solution
1.6 × 10-19 × 3.75 = 13.6 × 1.6 × 10-19
- 6.6 × 10-34 vTh
Solving, vTh = 1.6 × 1015 Hz
- 6.6 × 10-34 vTh Solving, vTh = 1.6 × 1015 Hz
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