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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: - When temperature of an ideal gas is increased from 27⁰C to 227⁰C,
- Two charged particles have charges and masses in the ratio 2:3 and 1:4 respectively.
- B is doped in Si or Ge, then we will get
- In the given figure, a diode D is connected to an external resistance R=100 Ω
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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
- When temperature of an ideal gas is increased from 27⁰C to 227⁰C,
- Two charged particles have charges and masses in the ratio 2:3 and 1:4 respectively.
- B is doped in Si or Ge, then we will get
- In the given figure, a diode D is connected to an external resistance R=100 Ω
- A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
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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