K K Sharma Solutions for Chapter: Waves, Exercise 1: TOPICWISE QUESTIONS

The power of sound from the speaker of radio is $20 \mathrm{mW}$. By turning the knob of the volume control, the power of the sound is increased to $400 \mathrm{mW}$. The power increase in decibels as compared to the original power is

If pressure amplitude in a sound wave is increased three times, then the percentage increase in the intensity of wave will be

The end correction of resonance tube is $1 \mathrm{cm}$. If lowest resonant length is $15 \mathrm{cm}$, then the next resonant length will be,

There are three sources of the sound of equal intensities with frequency $501 \mathrm{Hz}, 503 \mathrm{Hz}$ and $507 \mathrm{Hz}$. What is the beat frequency heard if all are sounded simultaneously?

The lengths of two closed organ pipes are $0.750 \mathrm{m}$ and $0.770 \mathrm{m}$. If they are sounded together in fundamental mode, $3 \mathrm{beats} {\mathrm{s}}^{-1}$ are produced. The velocity of sound will be

A tuning fork gives $4$ beats with the $50 \mathrm{cm}$ length of a sonometer wire. If the length of the wire is shortened by $1 \mathrm{cm}$, then the number of beats is still the same. The frequency of the fork is

Two tuning forks of frequency $250 \mathrm{Hz}$ and $256 \mathrm{Hz}$ produce beats. If a maximum is observed just now, after how much time the next maximum is observed at the same place?

A bus is moving with a velocity of $5 \mathrm{m} {\mathrm{s}}^{-1}$ towards a huge wall. The driver sounds a horn of frequency $165 \mathrm{Hz}$. If the speed of sound in air is $335 \mathrm{m} {\mathrm{s}}^{-1}$, then the number of beats heard by a passenger on the bus will be (Speed of sound $=335 \mathrm{m} {\mathrm{s}}^{-1}$)