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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 marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped
- The conductivity in the intrinsic semiconductor does not depend on
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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 marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped
- The conductivity in the intrinsic semiconductor does not depend on
- A particle of mass m is driven by a machine that delivers a constant power k watts
- If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
- A particle moves a distance x in time but according to equation x=(t+5)⁻¹
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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