Question:

In acoustics, “Noise” is generally characterized by

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Regular periodic vibrations produce musical sound, while irregular non-periodic vibrations produce noise.
  • Irregular and non-periodic vibrations
  • A constant pitch and frequency
  • Vibrations that follow a harmonic series
  • Regular and periodic vibrations
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The Correct Option is A

Solution and Explanation

Concept: Sound can be pleasant or unpleasant depending on the regularity of vibrations.

Step 1:
A musical sound is usually produced by regular and periodic vibrations.

Step 2:
Noise is an unwanted sound. It does not have a fixed pattern.

Step 3:
Noise is produced by irregular and non-periodic vibrations.

Step 4:
Therefore, noise is characterized by: \[ \boxed{\text{Irregular and non-periodic vibrations}} \]
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