Waves Test - 9...

A transverse wave travels on a taut steel wire with a velocity of $$v$$ when the tension in it is $$2.06\times { 10 }^{ 4 }N$$. When the tension is changed to $$T$$, the velocity changed to $$v/2$$. The value of $$T$$ is closet to:

The displacement of a particle varies according to the relation $$x = 4(\cos \pi t + \sin \pi t)$$. The amplitude of the particle is

Amplitude of a wave is represented by $$A = \dfrac {c}{a + b - c}$$. Then resonance will occur when

A simple wave motion represented by $$y=5(\sin 4\pi t+\sqrt 3 \cos 4\pi t)$$. Its amplitude is:

The phase change between incident and reflected sound wave from a free end is

Which of the following is conserved when light waves interfere?

Thickness of very thin films can be found by the technique of

Phase difference between a particle at a compression and a particle at the next rarefaction is

Two light waves are represented by $$y_{1}=4\sin  \omega t$$ and $$y_{2}= 3\sin(\omega t+\frac{\pi }{2} ) $$ . The resultant amplitude due to interference will be

For the sustained interference of light, the necessary condition is that the two sources should