When a body vibrates with its natural frequency, the force acting on the body is
a constant force
proportional to its displacement
zero
proportional to its velocity
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 frequency of ultrasonic vibrations is
more than 20000 Hz
between 20 and 10000 Hz
between 20 and 20000 Hz
less than 20 Hz
Sound waves travel with a speed of 346 m/s in air. What is the wavelength of sound whose frequency is 692 Hz?
0.5 m
5 m
0.05 m
50 m
The speed of sound of a wave of frequency 200 Hz in air is 340 m/s. The speed of sound of wave of frequency 400 Hz in same air is
340 m/s
680 m/s
170 m/s
3 ×108m/s
A noise level of 100 decibel would correspond to :
just audible sound
ordinary conversation
sound from a noisy street
noise from a machine shop
Sound is a form of
force
power
tendency
energy
The SI unit of frequency is
second
meter
hertz
meter per second
The example of a stringed instrument is
tabla
flute
mouthorgan
violin
Sonar makes use of the
infrasonic sound
ultrasound
ordinary sound
light
