PHYSICS [1 Mark Question Answer]

Bats emits its own distinctive sounds. The echoes of the sound help bat to navigate and to locate their prey during night.

The speed of sound depends on the direction of the wind. When the wind is blowing in the direction of the propagation of sound, the speed of sound increases. But, when the wind blows in the direction opposite to that of the sound, the speed of sound decreases.

Humidity: The speed of sound increases with an increase in humidity. The increase of moisture decreases the density of the atmosphere and therefore sound travels faster in moist air.

The speed of sound in air is independent of pressure of air.

We cannot hear each other on moon's surface because there is no air on moon and for sound to be heard, a material medium is necessary.

Sound is caused due to vibrations of a body.

The sound of 1000 Hz frequency will be audible to us. Others 2Hz is the infrasonic sound frequency and 200 kHz, 8 MHz is ultrasonic sound frequency.

The ratio of speed of sound in air to speed of sound in steel is 1/15.

With increase in density, there is decrease in the speed of sound in gas.

There is no effect on the wavelength and amplitude on the speed of sound.

Yes, we can hear in the darkroom.

No, it is not possible to hear the friend's voice in vacuum because sound needs a material medium to travel.

Yes, ultrasound in the medium travels faster than the audible sound.

No, SONAR does not make use of infrasonic waves. Instead, it make use of ultrasonic waves.

No, we cannot hear the sound produced due to the vibration of second's pendulum.

Ultrasonic sound has higher frequency than infrasonic sound.

SONAR stands for "sound navigation and ranging".

Ultrasonic are sounds having frequency higher that 20 KHz and not audible to the human being.

Using Laplace correction, the speed of sound in the gas is given by :
V = square root of (γP/ d ) where γ is the ratio of specific heat of the gas at constant pressure to that at constant volume.

No, the speed of sound in the gas is independent on the change in pressure of the gas.