General Physics Question 22
Question 22
- To find the distance
over which a signal can be seen clearly in foggy conditions, a railway engineer uses dimensional analysis and assumes that the distance depends on the mass density of the fog, intensity (power/area) of the light from the signal and its frequency . The engineer finds that is proportional to . The value of is
(2014 Adv.)
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Answer:
Correct Answer: 30. (d)
Solution:
- Let
where,
Equating the powers of
Solving these two equations, we get