Q8 of 54 Page 390

Ultrasonic are not used in:

Ultrasonic are used in SONAR, sibigraphy, CUSA but not radio waves.

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6

If the density of a medium through which sound is propagation is minimum, then this point is called:

 7

The audible range for a normal human being is:

 9

A bomb explodes on the Moon, How long will the sound of explosion take to reach the Earth?

 10

The walls of a hall built for musical concert should :