Waves Test - 12...

The phenomenon of interference is shown by 

In ordinary talk, the amplitude of vibration is approximately:

'Which is not true for a wave ?

The velocity of sound in a gas is 4 times that in air at the same temperature. When a tuning fork is sounded in a wave of frequency 480 and wavelength $$\lambda_1$$ is produced. The same fork is sounded in the gas and of $$\lambda_2$$ is the wavelength of the wave, then $$\lambda_2\,/\, \lambda_1$$ is :

In the following properties of a wave, the one which is independent of the other is

Time period of a sound wave having the wavelength $$0.2 m$$ and frequency $$10$$ Hz will be

The stethoscope used by doctors works on the principle of 

Two waves represented by $$y_1= a sin\omega t $$ and $$ y_2 = a sin(\omega t+ \phi) $$ and  $$ \phi =\dfrac{\pi}{2} $$ are superposed at any point at a particular instant. The resultant amplitude is

The SI unit of amplitude of oscillation is :

A source of frequency $$500   Hz$$ emits waves of wavelength $$0.2  \  m$$. The time the wave takes to travel a distance of $$300\    m$$ is :