| ⇦ | 
| ⇨ |
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 ratio of the acceleration for a solid sphere(mass m and radius R)rolling down
- If two charges +4e and +e are at a distance x apart, then at what distance charge q
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
- A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work
- A radioactive substance contains 10000 nuclei and its halflife period is 20 days
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The ratio of the acceleration for a solid sphere(mass m and radius R)rolling down
- If two charges +4e and +e are at a distance x apart, then at what distance charge q
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
- A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work
- A radioactive substance contains 10000 nuclei and its halflife period is 20 days
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