If fundamental frequency is 50 and next successive frequency are 150 and 250, then it is
A pipe closed at both ends
A pipe closed at one end
An open pipe
A stretched string
An observer standing by the side of a road hears the siren of an ambulance, which is moving away from him. If the actual frequency of the siren is 2,000 Hz, then the frequency heard by the observer will be
1,990 Hz
2,000 Hz
2,100 Hz
4,000 Hz
The frequency of a simple harmonic wave is given by where x and y are in meter and time is in second. The period of the wave in second will be
0.04
0.01
1
5
A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of sound in a tissue is 1.7 km/s. The wavelength of sound in tissue is close to
4 x 10-4 m
8 x 10-4 m
4 x 10-3 m
8 x 10-3 m
Following two wave trains are approaching each other y1 = a sin 200 t, y2 = a sin 208 t. The number of beats heard per second is
8
4
zero
The tension in piano wire is 10 N. What should be the tension in the wire to produce a note of double the frequency ?
5 N
20N
40 N
80 N
A motor cycle starts from rest and accelerates along a straight path at 2 m/s2. At the starting point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at 94% of its value when the motor cycle was at rest ? (Speed of sound = 330 ms-1).
49 m
98 m
147 m
196 m
The velocity of sound in any gas depends upon
wavelength of sound only
density and elasticity of gas
intensity of sound waves only
amplitude and frequency of sound
With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are
energy, momentum and mass
energy
energy and mass
energy and linear momentum
The heavenly body is receding from earth, such that the fractional change in is 1, then its velocity is
c