1. Choose the best answer I

Exercise condition:

4 m.

1. When a sound wave travels through air, the air particles

vibrate but not in any fixed direction
vibrate along the direction of the wave motion
vibrate perpendicular to the direction of the wave motion
do not vibrate.

2. The velocity of sound in a gaseous medium is \(330\) \(m/s\). If the pressure is increased by \(4\) times without causing a change in the temperature, the velocity of sound in the gas is

\(330\) \(m/s\)
\(660\) \(m/s\)
\(850\) \(m/s\)
\(360\) \(m/s\)

3. The frequency, which is audible to the human ear, is

\(50\) \(kHz\)
\(10000\) \(kHz\)
\(20\) \(kHz\)
\(15000\) \(kHz\)

4. The velocity of sound in air at a particular temperature is \(330\) \(m/s\). What will be its value when the temperature is doubled, and the pressure is halved?

\(165\) \(m/s\)
\(320 × √2\) \(m/s\)
\(330× √2\) \(m/s\)
\(330\) \(m/s\)

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