Speed of sound

Q.

What are the three types of sound waves?

Q.

Does sound travel faster than light?

Q.

What is the formula to find speed of sound if distance and time is given

Q.

Two waves of wavelength $1.00m$ and $1.01m$ produces $10beats$ in $3s$. What is the velocity of the wave?

1. $150m/s$

2. $115.2m/s$

3. $336.6m/s$

4. $200m/s$

Q. At room temperature, what is the velocity of sound in water?

1. 330 m/s
2. 1500 km/s
3. 330 km/s
4. 1500 m/s

Q.

An object moving at a speed greater than that of sound is moving at

1. ultrasonic speed

2. sonic speed

3. supersonic speed

4. infrasonic speed

Q.

A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why ?

Q.

A sound source emits sound waves of frequency 500 Hz and wavelength 0.2 m. How does it take the waves to travel 300 m.

1. 75 s

2. 60 s

3. 12 s

4. 3 s

Q.

A wave of frequency $100Hz$ travels with a velocity of $3m{s}^{-1}$. If the time
period of another wave is $8ms$, then its velocity and also the ratio of their
velocities are _________. (Assume that the wavelength of the two waves is
the same).

1. $\frac{30}{8}m{s}^{-1},\frac{5}{2}$

2. $\frac{15}{4}m{s}^{-1},\frac{4}{5}$

3. $\frac{30}{8}m{s}^{-1},\frac{2}{5}$

4. None of these

Q.

A wave of a time period of $20ms$ travel with a velocity of $2m{s}^{-1}$If the time period of another wave is$5ms$, then the velocity of the second wave and the ratio of their velocity is

(wave length of the two waves is same) _______ and _______, respectively

1. $0.8m{s}^{-1},\frac{7}{2}$

2. $0.25m{s}^{-1},\frac{5}{2}$

3. $8m{s}^{-1},\frac{1}{4}$

4. $Noneofthese$

Q.

How much longer would it take for sound to travel 1 km through arctic air at $-{50}^{O}C$ than to travel 1 km through desert air at $+{50}^{O}C$?

Q.

We see the lightning flash before we can hear thunder because_______.

1. Light travels faster than sound

2. Sound travels faster than light

3. The sound of lightning is generated only after the lightning flashes

4. None of these

Q. Speed of sound is the highest in:

1. Rubber
2. Oxygen
3. Nitrogen
4. Water

Q. At what temperature will the speed of sound be double of its value at 0°C?

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. 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. A stone dropped from the top of a tower of height $300m$ splashes into a pond of water at its base. When will the sound of the splash be heard at the top ?
( Take velocity of sound = $340m{s}^{-1}$ and acceleration due to gravity, $g=9.8m{s}^{-2}$)

1. $5.6s$
2. $8.7s$
3. $9.7s$
4. $4.7s$

Q. An observer stands at a distance of 850 m from the cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed of $350m{s}^{-1}$ in air?

1. 6.89 s
2. 4.00 s
3. 2.93 s
4. 4.86 s

Q. Sound will travel fastest in :

1. Air
2. Vacuum
3. Water
4. Steel

Q.

Two sounds in a medium are having wavelengths $1.3m$ and $3.9m$. A person listens to these sounds. What difference would the listener feel?

1. First sound is heard with higher pitch.

2. First sound is heard with better quality.

3. First sound is louder.

4. Second sound is heard with higher pitch.

Q. The speed of sound as measured by a student in the laboratory on a winter day is 340 m s⁻¹ when the room temperature is C17°. What speed will be measured by another student repeating the experiment on a day when the room temperature is 32°C?

Q. Speed of sound in air is about 330 m/sec, express the speed in kilometre per hour, how long will the sound take to travel 99 kilometre.

Q.

Sound travels faster through gases than liquids.

1. True
2. False

Q. The speed of sound is maximum in solids, less in liquids and least in air.

1. False
2. True

Q. In which of the following media does sound travel the fastest?

1. Solids
2. Gases
3. Liquids
4. Same in all media

Q. We see lightning before thunder, as the speed of light is more than the speed of sound in air.

1. False
2. True

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