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48 Science -- Sound

List out any two factors that affect the speed of sound in air. Write one use of ultrasound.

List out any two factors that affect the speed of sound in air. Write one use of ultrasound.

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For the creation of an echo, the minimum distance between the source and the object must be 17.2 m. In a small room, this condition is not fulfilled so, echo is not heard.

Solution:

Given,

Velocity = 350 m/s

Wavelength = 5 m

We know,

Velocity = Wavelength * Frequency

or, Frequency = Velocity / Wavelength

= 350 / 5

= 70 Hertz

Hence, the required frequency of the sound wave is 70 Hertz.

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