If The Amplitude Of A Sound Wave Is Doubled And Its Frequency Reduced To One-fourth, The Intensity Of Sound At The Same Point Will

An object producing a sound of frequency 400 Hz approaches a stationary person with a speed of 200 ms^–1. The speed of sound is 300 ms^–1. As the object flies past him, the person will note a change in frequency of  

The frequency of the sound of a car horn as received by an observer towards whom the car is moving differs from the frequency of the horn by 2.5%. If the speed of sound in air is

320 ms^–1, the speed of the car is

A cylindrical tube, open at both ends, has a fundamental frequency V in air. The tube is dipped vertically in water so that half of it is inside water. The fundamental frequency of the air column now is

The intensity of a sound wave falls by 10% in travelling a distance of 1 metre in a medium. If the initial intensity of the sound wave was 100 decibels, its value after it passes through 3 metres thickness of the medium will be

A tube closed at one end containing air, produces, when excited, the fundamental note of frequency 512 Hz. If the tube is open at both ends, the fundamental frequency that can be excited in (in Hz)

Two second waves of equal intensity I produce beats. The maximum intensity of sound produced in beats will be

Two waves of wavelength 2 m and 2.02 m moving with the same speed superpose to produce 2 beats per second. The speed of each wave is

The potential energy of a particle executing simple harmonic motion at a distance x from the equilibrium position is proportional to

Two travelling waves

and                

are superposed on a string. The distance between adjacent nodes is

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of the string at that instant is a