Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Wave Motion, Exercise 1: Classical Thinking

In a plane progressive harmonic wave, particle speed is always less than the wave speed, if

Which two of the following waves are in the same phase?
(I) $y=A\sin (kx-\omega t)$
(II)$y=A\sin (kx-\omega t+\mathrm{\pi })$
(III) $y=A\sin (kx-\omega t+\frac{\mathrm{\pi }}{2})$
(IV) $y=A\sin (kx-\omega t+2\mathrm{\pi })$

The given figure shows an incident pulse $P$ reflected from a rigid support.

Which one of $A\mathit{,}\mathit{ }B\mathit{,}\mathit{ }C\mathit{,}\mathit{ }D$ represents the reflected pulse correctly?
 

What is phase difference, when longitudinal wave is reflected from rigid wall?

Wavelength of wave is a distance between two particles in phase differing by

When a longitudinal wave is incident on a rigid wall,

Two waves $y_1=A_1\sin \left(\omega t-{\beta }_1\right), y_2=A_2\sin \left(\omega t-{\beta }_2\right)$ superimpose to form a resultant wave whose amplitude is

A sine wave is travelling in a medium. The minimum distance between two particles always having same speed is $(\lambda$ is the wavelength of wave)