Sound Test - 34...

The separation between two consecutive crests in a transverse wave is $$100 \ m$$. If wave velocity is $$20  \ ms^{-1}$$, find the frequency of wave.

State the approximate speed of ultrasound in air.

Sound of frequency above $$20kHz$$ is called as 

A sound of wave produces $$40$$ crests and $$40$$ troughs in $$0.4s$$. What is the frequency of the wave?

On the basis of following features identify correct option:
I.   It is the characteristic of a sound.
II.  It distinguishes an acute or a shrill note from a dull or flat note.

Consider the following statement:
(a) Sound waves are longitudinal in nature.
(b) Sound waves cannot travel through vacuum.
(c) Sound waves are produced by oscillating charged particles only.
(d) Sound waves are electromagnetic waves.
Which of the following statements are correct ?

A longitudinal wave is produced on a toy slinky. The wave travels at a speed of 30 cm/s and the frequency of the wave is 20 Hz. What is the minimum separation between the consecutive compressions of the slinky?

A longitudinal wave travels at a speed of $$0.3 \ ms^{-1}$$ and the frequency of wave is $$20 \ Hz$$. Find the separation between two consecutive compressions.

A boat at anchor is rocked by waves whose consecutive crests are 100 m apart. The wave velocity of the moving crests is 20 m/s. What is the frequency of rocking of the boat?

A bat can hear sound at frequencies up to 120 kHz. Determine the wavelength of sound in the air at this frequency. Take the speed of sound in the air as 344 m/s :