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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: - Eddy currents are used in
- The flux linked with a coil at any intant t is given by ?=10t² – 50t + 250
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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
- Eddy currents are used in
- The flux linked with a coil at any intant t is given by ?=10t² – 50t + 250
- When there is no heat change from surroundings in a system, then the process
- Radius of a soap bubble is increased from R to 2R. Work done in this process
- A transformer is used to light a 100 W and 110 V lamp from a 220 V mains.
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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