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48 Science -- Sound

What are infra and ultra sound? The sound is heard louder at night than at day, why?

What are infra and ultra sound? The sound is heard louder at night than at day, why?

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Echo is not heard in a small room, why? The speed of sound wave is 350 m/s and its wave length is 5 meter . What is its frequency?

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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