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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.
Related Questions: - The temperature of ideal gas is reduced from 927° C to 27° C. The r.m.s velocity
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- Two metal spheres of radii 0.01m and 0.02m are given a charge of 15mC and 45mC
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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
- The temperature of ideal gas is reduced from 927° C to 27° C. The r.m.s velocity
- The moment of inertia of a uniform circular disc of radius R and mass M about an axis
- Two metal spheres of radii 0.01m and 0.02m are given a charge of 15mC and 45mC
- In Young’s double slit experiment, the ratio of maximum and minimum intensities
- The induced emf in a coil of 10 H inductance in which current varies
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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