Embibe Experts Solutions for Chapter: Waves, Exercise 1: Exercise

The equation of a progressive wave is given by $\mathrm{y}=\mathrm{a}\sin \left(628\mathrm{t}-31.4\mathrm{x}\right)$. If the distances are expressed in $\mathrm{cm}$ and time in seconds, then the wave velocity will be

The velocity of sound wave is maximum in

Two strings $\mathrm{A} \mathrm{and} \mathrm{B}$ are of same material. The Radius of $\mathrm{A}$ is double that of $\mathrm{B}$. If same tensions are applied to keep the strings stretched, what would be ratio of the speed of a transverse wave $\left({\mathrm{\vartheta }}_{\mathrm{A}}/{\mathrm{\vartheta }}_{\mathrm{B}}\right)$ on the stings.  

The temperature at which speed of sound in air is double its speed at $0°\mathrm{C}$ is

Which of the following properties of sound is affected by change in air temperature?

Two waves of equal amplitude $\mathrm{A}$ and equal frequency $v$ travel in medium in same direction. The amplitude of the resultant wave is.

Two cars $A$ and $B$ approaches a stationary observer from opposite sides with speed $15 \mathrm{m} {\mathrm{s}}^{-1}$ and $30 \mathrm{m} {\mathrm{s}}^{-1}$ respectively. Observer hears no beats. If the frequency of the horn of the car $B$ is $504 \mathrm{Hz}$, then the frequency of the horn of the car $A$ will be:

[Take speed of sound = $330 \mathrm{m} {\mathrm{s}}^{-1}$]

When a source of sound wave and an observer approach each other in static air medium, then the wavelength of sound wave appears to the observer to