Waves

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is

A car is moving towards a high cliff. The driver sounds a horn of frequency \(f\). The reflected sound heard by the driver has frequency \(2f\). If v is the velocity of sound, then the velocity of the car, in the same velocity units, will ...

The phase difference between two waves. represented by
y1 = 10\(-\)6 sin[100t + (x/50) + 0.5] m
y2 = 10\(-\)6 cos[100t + (x/50)] m,
where x is expressed in metres and t is exressed in secondss, is approximately.

An observer moves towards a stationary source of sound with a speed 1/5th of the speed of sound. The wavelength and frequency of the source emitted are \(\lambda\) and \(f\) respectively. The apparent frequency and wavelength recorded by t...

A wave travelling in positive X-direction with a \(=\) 0.2 ms\(-\)2, velocity = 360 ms\(-\)1 and \(\lambda\) \(=\) 60 m, then correct expression for the wave is

A whistle revolves in a circle with angular speed \(\omega\) = 20 rad/s using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from th...

The equation of a wave is represented by
y \(=\) 10\(-\)4 sin(100t \(-\) \({x \over {10}}\)) m. then the velocity of wave will be

If the tension and diameter of a sonometer wire of fundamental frequency n is doubled and density is halved then its fundamental frequency will become

Two waves having equation x1 = \(a\)sin(\(\omega\)t \(-\) kx + \(\phi\)1), x2 = asin(\(\omega\)t \(-\)kx + \(\phi\)2). If in the resultant wave the frequency and amplitude remain equal to amplitude of superimposing waves, the phase diff...

The equations of two waves acting in perpendicular directions are given as
x = \(a\)cos(\(\omega\)t +\(\delta\)) and y = \(a\)cos(\(\omega\)t + \(\alpha\)), where \(\delta\) = \(\alpha\) + \({\pi \over 2}\), the resultant wave repr...

Two stationary sources each emitting waves of wavelength \(\lambda\), an observer moves from one source to another with velovcity u. Then number of beats heard by him

A string is cut into three parts, having fundamental frequencies n1, n2, n3 respectively. Then original fundamental frequency n related by the expression as