Speed of Sound

Q. A sound source sends waves of 400 Hz. In a medium, this sound has a wavelength of 2.5 m. Find the speed of sound waves in the medium.

1. $100m{s}^{-1}$
2. $1000m{s}^{-1}$
3. $10000m{s}^{-1}$
4. $3000m{s}^{-1}$

Q. The wavelength of a sound wave is $40cm$ and the time period is $0.0005s$. How many seconds will it take to travel a distance of $4km$?

1. $11s$
2. $7s$
3. $16s$
4. $5s$

Q. A sound wave having a wavelength of $2cm$ is travelling in water. If the velocity of sound in water is $1600m{s}^{-1}$. What is the frequency of the sound wave?

1. $16000Hz$
2. $8000Hz$
3. $80000Hz$
4. $70000Hz$

Q. A boy fires a gun and another boy at a distance of 1360 m hears the sound of firing the gun 4 s after its smoke is seen. Find the speed of sound.
(2 marks)

Q. A person is standing $1km$ away from a source of sound. The velocity of sound in the medium is $340m{s}^{-1}$. Calculate the number of oscillations (approximately) that the sound wave makes before it reaches that person. The frequency of the sound is $500Hz$.

1. 1450
2. 340
3. 1470
4. 1417

Q. A guitar produces a sound which has a frequency of $300Hz$ and a wavelength of $1.3m$. Calculate the speed with which this sound travels.

1. $300m{s}^{-1}$
2. $400m{s}^{-1}$
3. $280m{s}^{-1}$
4. $390m{s}^{-1}$

Q. The wavelength of a sound in a medium is $50cm$. If wave velocity is $25m{s}^{-1}$, then what is the time period?

1. $0.04s$
2. $0.06s$
3. $0.03s$
4. $0.02s$

Q. A sound is travelling in air at a speed of $343m{s}^{-1}$. The wavelength of the sound wave is $0.1cm$. Find the frequency of the sound wave.

1. $633000Hz$
2. $343000Hz$
3. $543000Hz$
4. $400000Hz$

Q. A sound is travelling in air at a speed of $343m{s}^{-1}$. The wavelength of the sound wave is $0.1cm$. Find the frequency of the sound wave.

1. $543000Hz$
2. $343000Hz$
3. $400000Hz$
4. $633000Hz$

Q. The wavelength of a sound wave is $40cm$ and the time period is $0.0005s$. How many seconds will it take to travel a distance of $4km$?

1. $5s$
2. $11s$
3. $7s$
4. $16s$