Q10 of 25 Page 73

Ultrasound has frequency of vibration

Ultrasound has frequency of vibration higher than 20,000Hz. Some animals like dogs can hear sounds of frequencies higher than 20,000 Hz. Thus, dogs are used in investigation process.

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8

1 hertz is equal to

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Pitch of sound is determined by its

 11

Lightning can be seen the moment it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs?

(speed of sound = 330 m/s).

 12

Does any part of our body vibrate when we speak? Name the part.