If the amplitude of wave at a distance r from a point source is A, then amplitude at a distance 2r will be?
Everyday Science / Branch of Science — Multiple-choice practice
- A. A/4
- B. 4A
- C. A/2
- D. 2A
Correct answer
A/2
Explanation
Explanation For a point source in 3D, amplitude is inversely proportional to the distance from the source: A ∝ 1/r So, if distance doubles (2r), amplitude becomes A/2 .
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