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A 5 watt source emits monochromatic light of wavelength 5000Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.. m, the number of photoelectrons liberated will be reduced by a factor of
Options
(a) 8
(b) 16
(c) 2
(d) 4
Correct Answer:
4
Explanation:
No. of emitted electrons Nₑ ∞ Intensity ∞ 1 / (distance)²
Therefore, as distance is doubled, Nₑ decreases by (1/4) times.
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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In an ac circuit an alternating voltage e = 200 √2 sin 100 t volts is connected
- If capillary experiment is performed in vaccum, then a liquid under the condition
- If a vector 2i+3j+8k is perpendicular to the vector 4j-4i+αk, then value of α is
- The ratio of the weight of a man in a stationary lift and when it is moving downwards
- The distance of the closest approach of an alpha particle fired at a nucleus
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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