Q10 of 33 Page 174

Give two practical applications of reflection of sound waves.

Bulb horn and Stethoscope are examples of practical applications of reflection of sound waves.

In bulb horn sound is amplified and sent to the desired direction because of reflection. In stethoscope also sound is sent to the desired direction because of its reflection characteristic.


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8

Does sound follow the same laws of reflection as light does? Explain.

 9

When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

 11

A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Giving g = 10 m s-2 and speed of sound = 340 m s-1.

 12

A sound wave travels at a speed of 339 m s-1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?