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A point source is kept at a distnace 1000m has an illumination I. To change the illumination to 16I, the new distance should become
Options
(a) 250 m
(b) 500 m
(c) 750 m
(d) 800 m
Correct Answer:
250 m
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
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Topics: Wave Optics
(101)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- For a satellite moving in an orbit around the earth, the ratio of kinetic
- Two satellites of earth, S₁ and S₂ are moving in the same orbit. The mass of S₁
- The position vector of a particle R as a function of time is given by
- Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV.
- A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹.
Topics: Wave Optics (101)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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