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
Which of the following is not a characteristic of musical sound ?
Pitch
Wavelength
Quality
Loudness
Calculate the velocity of sound in Nitrogen. Density of Nitrogen at STP is 0.00125gm/cm3. The ratio of specific heats of Nitrogen is 1.4.
336.91m/s
336.91/s
3369.1m/s
3151cm/s
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.
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
The average person can hear sound waves ranging in frequency from about 20 Hz to 20,000Hz . Determine the wavelengths at these limits.
0.059m, 58.8m
17m,1.7cm
6800m,6.8 × 106m
17m, 0.0017m
What is called the air pressure variation associated with shock waves produces a very sharp and loud sound?
Super sonic boon
Sonic boon
Ultra sonic boon
Infra sonic boon
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.
What is the amplitude of a wave?
the distance the wave moves in one second
the distance the wave moves in one time period of the wave
the maximum distance moved by the medium particles on either side of the mean position
the distance equal to one wave length