Question Detail

PHY 104 Pitch, loudness, quality, timber Objective Question
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Question

How does the intensity of a sound wave generally vary with distance (r) from its source?
Options
A Directly proportional to r
B Inversely proportional to r
C Directly proportional to r<sup>2</sup>
D Inversely proportional to r<sup>2</sup>
Correct Answer
Correct Answer

Option D is the correct answer.

Detailed Explanation

The section 'Variation of Intensity of Sound with distance from the source' explicitly states, 'The intensity of a sound wave falls with distance in an inverse-square manner. That is, I ∝ Io / r2'.

Hint

Consider how energy spreads out from a point source in a three-dimensional space.

Question Info

Course: PHY 104
Topic: Pitch, loudness, quality, timber
Type: Objective
Difficulty: Not specified
Question 404 of 947
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