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For a given photosensitive metal, the photoelectric current at fixed frequency (above threshold) depends on the intensity of light as
A{'text': 'Decreases with intensity', 'label': 'A'}
B{'text': 'Increases linearly with intensity', 'label': 'B'}
C{'text': 'Is independent of intensity', 'label': 'C'}
D{'text': 'Varies inversely with intensity', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Increases linearly with intensity', 'label': 'B'}
1. NCERT explicitly notes photocurrent varies linearly with intensity of incident light.
2. Photocurrent is proportional to the number of photoelectrons emitted per second.
3. Intensity determines how many photons hit the surface per second.
4. So photoelectron rate — and photocurrent — scale linearly with intensity.
_Source: NCERT Class 12 Physics, Ch 11 "Dual Nature of Radiation and Matter", §11.4.1_
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