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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.
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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
- The electric and magnetic field assiciated with an E.M. wave
- A 1m long wire of diameter 0.31 mm has a resistance of 4.2Ω. If it is replaced by
- Two rigid bodies A and B rotate with rotational kinetic energies Eᴀ and Eʙ
- A particle moving in a straight line with uniform acceleration is observed
- The capacitance of two concentric spherical shells of radii R₁ and R₂ (R₂>R₁) is
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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