What is called the amount of sound energy passing each second through unit area?
Young’s modulus
Intensity of sound
Amplitude
Frequency
An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and receiving of the wave is 1.6s. What is the depth of the sea, if the velocity of sound in the seawater is 1400m/s?
1120m
560m
1400m
112m
A bobber on a fishing line oscillates up and down two times per second as waves pass by. The waves have a wavelength of 10cm. What is the velocity of the wave?
5 cm/s
10 cm/s
20 cm/s
980 cm/s
Pick out the most correct
The higher the frequency shorter its speed
The higher the frequency the shorter its wavelength
The higher the frequency greater its amplitude
The higher the frequency longer its period
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
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
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
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
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.
