Explanation
The contrast will be maximum, when I1 = I2 i.e, a = b. In that event, Imin.= (a – b)2 = 0 .
When amplitude, frequency and phase are same, resultant from of vibration is along a straight line.
The waves produced in a sonometer string are transverse stationary wave, which are polarised.
As passenger is a part of moving train, there is no relative motion between source and listener. Therefore, n’ = n = 200hz
Distance travelled by each pulse= velocity × time = 2 × 2 = 4cm. therefore, after 2 seconds, the two pulses overlap each other, being at the same position. P.E. becomes zero, and the total energy of the pulses is purely kinetic.
If we assume that all the three waves are in same phase at t = 0, we shall hear only 1 beat s–1
Frequency of vibration in fundamental mode is given by
is the correct choice because its value is finite at all times
Z1 and Z2 are displacements of two waves of same frequency travelling in opposite directions. They will form a stationary wave.
The amplitude of a plane progressive wave = a, that of a spherical progressive wave is a/r and that of a cylindrical progressive wave is a /√ r
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