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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: - If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
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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
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
- Zener diode is used
- A particle is dropped vertically from rest, from a height.The time taken by it to fall
- A radioactive substance decays to 1/16th of its initial activity in 40 days.
- A small oil drop of mass 10⁻⁶kg is hanging in at rest between two plates seperated
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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