Standing wavesare produced in a 10 m long stretched string. If the string vibrates in 5 segments and the wave velocity is 20 m/s, the 5 segments and the wave velocity is 20 m/s, the frequency is
10 Hz
5 Hz
4 Hz
2 Hz
A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of 128 ms-1 and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is
y = (0.02)m sin(7.85 x + 1005t)
y = (0.02)m sin (15.7x -2010t)
y = (0.02)n sin (15.7x + 2010t)
y = (0.02)m sin (7.85x - 1005t)
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 a sound in a tissue is 1.7 km/s. 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 x10-4 m
4 x10-3 m
8 x10-3 m
The wave described by
where x and y are in metre and t in second, is a wave travelling along the
Equations of two progressive waves are given by
If amplitude and time period of resultant wave are same as that of both the waves, then
The driver of a car travelling with speed 30 ms-1 towards a hill sounds a horn of frequency 600 Hz. If the veocity of sound in air is 330 ms-1, the frequency of reflected sound as heard by driver is
550 Hz
555.5 Hz
720 Hz
500 Hz
A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with
a phase change of 1800 with velocity reversed
the same phase as the incident pulse with no reversal of velocity
a phase change of 1800 with no reversal of velocity
the same phase as the incident pulse but with velocity reversed
A star which is emitting radiation at a wavelength of 5000 is approaching the earth with a velocity of 1.50 x106 m/s. The change in wavelength of the radiation as received on the earth is
A standing wave is represented by y =a sin (100t ) cos (0.01)x, where y and a are in millimetre, t in seond and x is in metre. Velocity of wave is
104 m/s
1 m/s
10-4 m/s
Not derivable from above data
A transverse wave propagating along x-axis is represented by
Where x is in metre and t is in second. The speed of the wave is