| ⇦ | 
| ⇨ |
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: - Which pair is isotonic?
- If a star converts all helium in its core to oxygen, then energy released per oxygen
- A current of 2A flows through a 2Ω resistor when connected across a battery
- For photoelectric emission from certain metal the cut-off frequency is v
- The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which pair is isotonic?
- If a star converts all helium in its core to oxygen, then energy released per oxygen
- A current of 2A flows through a 2Ω resistor when connected across a battery
- For photoelectric emission from certain metal the cut-off frequency is v
- The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights
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