In a sonar, ultrasonic waves are sent into the sea water and the reflected waves from a sunken ship are received after 2.0 s. If the velocity of waves in sea water is 1450 m/s, find the depth of the sunken ship.
1250 m
1350 m
1450 m
1500 m
A man standing 48 m away from a wall fires a gun. The echo is heard after 0.3 seconds. What is the speed of the sound?
320 m/s
400 m/s
300 m/s
340 m/s
If a wave completes 20 vibrations in 2.5 s, then its frequency is
8 Hz
20 Hz
50 Hz
200 Hz
A bat can hear sound at frequency up to 120 kHz. Determine the wavelength of sound in air at this frequency. Take the speed of sound in air to be 344 m/s.
2.87 mm
2.56 mm
3.58 mm
2.42 mm
The ultrasound waves can penetrate into matter to a large extent because they have
very high speed
very high frequency
very high wavelength
very high amplitude
If 15 waves are produced per second, what is the frequency?
30 Hz
15 Hz
1/15 Hz
A sound wave travels at a speed of 330 m/s. If its wavelength is 1.5 cm, calculate the frequency of the sound wave.
22 kHz
30 kHz
10 kHz
35 kHz
The properties of ultrasound that make it useful are :
high power and high speed
high power and good directivity
high frequency and high speed
high frequency and bending around the objects
A noise level of 100 decibel would correspond to :
just audible sound
ordinary conversation
sound from a noisy street
noise from a machine shop
One of the following can hear infrasound. This one is
dog
bat
rhinoceros
humans
