The speed of sound in oxygen (O2) at a certain temperature is 460 ms-1.The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)
460 ms-1
500 ms-1
650 ms-1
1420 ms-1
Two waves are said to be coherent, if they have
same phase but different amplitude
same frequency but different amplitude
same frequency, phase and amplitude
different frequency, phase and amplitude
The plane wave is described by the equation
30 ms-1
40 ms-1
The loudness and pitch of a sound note depends on
Intensity and frequency
Frequency and number of harmonics
Intensity and velocity
Frequency and velocity
Energy not carried by which of the following wave ?
Stationary
Progressive
Transverse
Electromagnetic
A metal wire of linear mass density of 9.8 gm-1 is stretched with a tension of 10 kg wt between two rigid supports 1 m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance, when carrying an alternating current of frequency v. The frequency v of the alternating source is
50 Hz
100 Hz
200 Hz
25 Hz
A source emits a sound of frequency of 400 Hz, but the listener hears it's to be 390 Hz. Then
The listener is moving towards the source
The is source moving towards the listener
The listener is moving away from the source
The listener has a defective ear
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
1
zero
A particle on the trough of a wave at any instant will come to the mean position after a time (T = time period)
T
2T
Length of a string tied to two rigid supports is 40 cm. Maximum length (wavelength in cm) of a stationary wave produced on it is
20
80
40
120
