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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: - At a given temperature the root mean square velocities of oxygen and hydrogen
- An astronomical telescope arranged for normal adjustment has a magnification of 6.
- The ratio of magnetic dipole moment of an electron of charge e and mass m
- A body of mass 4 kg is accelerated upon by a constant force travels
- The near point and far point of a person are 40 cm and 250 cm, respectively.
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- At a given temperature the root mean square velocities of oxygen and hydrogen
- An astronomical telescope arranged for normal adjustment has a magnification of 6.
- The ratio of magnetic dipole moment of an electron of charge e and mass m
- A body of mass 4 kg is accelerated upon by a constant force travels
- The near point and far point of a person are 40 cm and 250 cm, respectively.
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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