When a sound wave travels through air, the air particles

(a)

vibrate along the direction of the wave motion

(b)

vibrate but not in any fixed direction

(c)

vibrate perpendicular to the direction of the wave motion

(d)

do not vibrate

The frequency, which is audible to the human ear is

(a)

50 kHz

(b)

20 kHz

(c)

15000 kHz

(d)

10000 kHz

The velocity of sound is affected by

(a)

temperature

(b)

density

(c)

pressure

(d)

all the above

The speed of sound in air is 300 m/s. What is the frequency as heard by the human ear?

(a)

0.001 Hz

(b)

1 Hz

(c)

10,000 Hz

(d)

1,00,000 Hz

Infrasound can be heard or produced by

(a)

dog

(b)

bat

(c)

rhinoceros

(d)

human beings

Rapid back and forth motion of a particle about its mean position is called _____

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Vibration

If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in _____

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South to north

A wave motion is a transfer of _______.

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energy

For propagation of sound wave, the medium must possess________.

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volume elasticity

Speed of sound in solid is ________ than liquid

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greater

Infrasonic

(1)

10 Hz

Echo

(2)

E∝A²

Ultrasonic

(3)

Distance

Wavelength

(4)

22 kHz

Amplitude

(5)

Ultrasonography