Embibe Experts Solutions for Chapter: Wave Motion on a String, Exercise 3: Exercise-3

Which of the following four alternatives is not correct? We need modulation:

Choose the correct statement :

An amplitude modulated signal is plotted below:

Which one of the following best describes the above signal?

If $n_1, n_2, n_3$ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by

Five sinusoidal waves have the same frequency $500 \mathrm{Hz}$ but their amplitudes are and the ratio $2 : \frac{1}{2} : \frac{1}{2} : 1 : 1$ and their phase angles  $0,\frac{\pi }{6},\frac{\pi }{3},\frac{\pi }{2}$ and $\pi$ respectively. The phase angle of resultant wave obtained by the superposition of resultant wave obtained by the superposition of these five waves is

The transverse displacement $y \left(x,t\right)$ of a wave on a string is given by, $y \left(x,t\right)=e^{-\left(a{x}^2+b{t}^2+2\sqrt{ab}xt\right)}$. This represents a

A travelling wave represented by $y=a\sin \left(\omega t-kx\right)$ is superimposed on another wave represented by, $y=a\sin \left(\omega t+kx\right)$. The resultant is

A uniform string of length $20 \mathrm{m}$ is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is (Take, $g=10 \mathrm{m} {\mathrm{s}}^{-2}$)