The wavelength of a sound wave in air is 2.40m at 20oC. Speed of sound in sea water = 1531m/s at 20oC. What is the wavelength of this sound wave in fresh water? (Hint: The frequency of sound wave is the same in both medium).
12.87m
637.92
C. 142.92
10.71m
Match the following and select the correct answer.
a) speed 1. ms-2
b) sound intensity 2. Dynes/ cm2
c) acceleration 3. Newton
d) young’s modulus 4. dB
e) force 5. m/s
a-5, b-2, c-3, d-4,e-5
a-3,b-4, c-1,d- 4,e-2
a-5,b-4, c-1, d-2, e-3
a-5, b-4, c-3, d- 2,e- 1
A source of frequency of 500Hz emits waves of wavelength 0.4m. How long does the wave take to travel 600m?
3s
6s
9s
12s
If you strike a horizontal rod vertically from above, what can be said about the waves created in the rod?
The particles vibrate horizontally along the direction of the rod.
The particles vibrate vertically, perpendicular to the direction of the rod.
The particles vibrate in circles, perpendicular to the direction of the rod.
The particles travel along the rod from the point of impact to its end.
An echo returned in 5sec. What is the distance of the reflecting surface from the source, given that the speed of sound is 340 m s−1?
1700m
68m
850m
170m
Pick out the most correct from the following:
Velocity of sound in gases is highest and least in solids and the velocity in gases increases with temperature
Velocity of sound in solids is highest and least in gases and the velocity in gases decreases with temperature
Velocity of sound in gases is the highest and least in solids and the velocity in gases decrease with temperature
Velocity of sound in solids is the highest and least in gases and the velocity in gases increase with temperature
How did the bats detect the obstacles in their path?
By receiving the reflected infrasonic waves
By receiving the reflected radio waves
By receiving the reflected electro-magnetic waves
By receiving the reflected ultrasonic waves.
What is called the amount of sound energy passing each second through unit area?
Young’s modulus
Intensity of sound
Amplitude
Frequency
Two sound waves are travelling through a container of unknown gas. Wave A has a wavelength of 1.2m. Wave B has a wavelength of 3.6m. What is the velocity of wave B in comparison with the velocity of wave A.
One-third of the wave A
One-ninth of the wave A
The same as the wave A
Three times larger than
Which of the following is not a characteristic of musical sound ?
Pitch
Wavelength
Quality
Loudness
