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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: - A toroid having 200 turns carries a current of 1 A. The average radius of the toroid
- The rms current in an AC circuit is 2 A. If the wattless current be √3 A,
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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
- A toroid having 200 turns carries a current of 1 A. The average radius of the toroid
- The rms current in an AC circuit is 2 A. If the wattless current be √3 A,
- An electric motor operating on a 60 volt D.C supply draws a current of 10 amp.
- The ratio of the radii or gyration of a circular disc to that of a circular ring
- The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number
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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