Ncert Exercises & Solutions

Change in temperature of the medium changes

1. frequency of sound waves

2. amplitude of sound waves

3. wavelength of sound waves

4. loudness of sound waves

(3) Hint: The speed of the sound waves depends on the temperature of the medium.

Step 1: Find the speed of the sound waves in terms of temperature.

Speed of sound wave in a medium,

ν \propto \sqrt{T}

(where T is the temperature of the medium)

Clearly, when temperature changes, the speed also changes.

Step 2: Find the variation in the frequency and the wavelength.

As,

ν = νλ

where v is the frequency and

λ

is the wavelength.

Frequency (

ν

) remains fixed,

\Rightarrow ν \propto λ or λ \propto ν

As the frequency does not change, so the wavelength (

λ

) changes.