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

Graphs representing two sound waves are shown in the given figure. If the scales on the X and Y axes of the two graphs are the same, which of the two sound waves has:

(A) greater wavelength?

(B) smaller amplitude?

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Answer: Verified

(A) Wave (I) has the greater wavelength because the distance between its consecutive crests and troughs is larger.

(B) Wave (I) has the smaller amplitude, as the height of its crests and the depth of its troughs from the mean density line are less than those of wave (II).

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