Question Detail

PHY 104 Wave and sound Objective Question
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Question

How does the intensity of a sound wave vary with distance (r) from the source?
Options
A Directly proportional to r
B Inversely proportional to r
C Directly proportional to r²
D Inversely proportional to r²
Correct Answer
Correct Answer

Option D is the correct answer.

Detailed Explanation

On page 20, under 'Variation of Intensity of Sound with distance from the source,' it is stated: 'The intensity of a sound wave falls with distance in an inverse-square manner. That is, I ∝ 1/r².'

Hint

Recall the inverse-square law for energy propagation from a point source.

Question Info

Course: PHY 104
Topic: Wave and sound
Type: Objective
Difficulty: Not specified
Question 349 of 947
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