| ⇦ | 
| ⇨ |
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: - The physical quantity which does not have the same dimensions as the other three is
- α- particles, β – particles and γ – rays are all having same energy.
- A particle moves a distance x in time but according to equation x=(t+5)⁻¹
- The relationship between decay constant λ and half-life T of a radioactive substance is
- A spring when stretched by 2mm containing energy 4 J. If it is stretched
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The physical quantity which does not have the same dimensions as the other three is
- α- particles, β – particles and γ – rays are all having same energy.
- A particle moves a distance x in time but according to equation x=(t+5)⁻¹
- The relationship between decay constant λ and half-life T of a radioactive substance is
- A spring when stretched by 2mm containing energy 4 J. If it is stretched
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply