Chapter 10
Sound Waves: Characteristics and Applications
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

The sound waves emitted by three sources A, B and C are represented in the given figure. If the frequency of A is maximum and C is minimum, identify the corresponding curves, and mark A, B and C on them.

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Answer: Verified

Frequency depends on the number of oscillations produced in a given time. The wave with more oscillations has higher frequency, while the wave with fewer oscillations has lower frequency.

• The thick curve line has the maximum number of oscillations, so it represents A (maximum frequency).

• The dotted curve has the minimum number of oscillations, so it represents C (minimum frequency).

• The thin curve line represents B.

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