Level 1

When a sound wave is reflected from the boundary of a denser medium, the compression of the incident wave is returned as:

The equation of a progressive wave is, $y=0.02\sin 2\pi \left[\frac{t}{0.01}-\frac{x}{0.3}\right]$ where, $x$ and $y$ are in $\mathrm{meters}$ and $t$ is in $\mathrm{second}$. The velocity of propagation of the wave is,

If the ratio of amplitudes of two waves at any point in the medium is $1:3$, then the ratio of maximum and minimum intensities due to their superposition will be

The equation of a progressive wave is given by, $y=a\sin (\omega t-kx)$. Then, which of the following equations is not correct?

Two-wire of length $1 \mathrm{m}$ and $2 \mathrm{m}$, respectively, and mass $150 \mathrm{gm}$ and $300 \mathrm{gm}$, respectively. If the tensions are the same on both the wires, the ratio of velocities of transverse waves will be

Matter waves are

A wave is reflected from a rigid support. The change in the phase of the reflected wave will be

Two vibrating strings ' $A$ ' and ' $B$ ' produce beats of frequency $8 \mathrm{Hz}$. The beat frequency is found to reduce to $4 \mathrm{Hz}$ if the tension in the string $\text{'}A\text{'}$ is slightly reduced. If the original frequency of $A$ is $320 \mathrm{Hz}$, then the frequency of $B$ ' is