Question:

In Acoustics, 'Noise' is generally characterized by:

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Music has patterns; Noise has none.
  • 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


Step 1: Concept

Sound is classified into musical notes (periodic/regular) and noise (non-periodic/irregular).

Step 2: Meaning

Noise lacks a distinct pitch because it is a complex mixture of many frequencies without a harmonic relationship.

Step 3: Analysis

Regular vibrations produce pleasant musical sounds, while irregular, sudden changes in pressure lead to the sensation of noise.

Step 4: Conclusion

Thus, noise is characterized by irregular and non-periodic vibrations.
Final Answer: (A)
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