A frequency of the horn of a car drops from 280 Hz to 240 hz as the car passes a stationary observer.What is the speed of the car?[velocity of the sound in the air is 330 `m(s)^-1].

The frequency of horn of a car drops by 10% as the car passes a stationary observer.What is the speed of the car?[velocity of sound = 330 m/s]

A train moving with speed 72 Km/hr blows its whistle of 200 Hz.What frequency is heard by a stationary observer?[velocity of sound in air = 330 m(s)^-1 ]

You are asked to prepare open organ pipe having fundamental frequency 240.What should be the length of the pipe?[velocity of sound in air =330 m/sec)

In a organ pipe closed at one and at 20^@C the fundamnetal frequency 256 HZ. What is the length of the pipe (velocity of bound in air at 0^@C is 332 m/s.

Two organ pipes one open at both ends,and the other open at one end only give their fundamental noteswhose frequencies differ by 25 vibration per second.The length of the open pipre is 96 cm.Calculate the length of the closed pipe if the velocity of sound in air is 330 m(s)^-1 .

An echo was heard after 3s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 ms^-1 ?

A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s^-1 .

A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s.The frequency heard by the observer in Hz is (velocity of sound = 333m/s)

What is the fundamental frequency at 20^@C of an open pipe of length 120 cm? The velocity of sound in air at 20^@C is 343 m//s .

A train whistling while approaching a railway platform with a speed of 90 km(s)^-1 .The frequency of sound of the whistle is 600 Hz.If the velocity of sound in air is 325 m(s)^-1 ,calculate the apparent frequency of the sound of the whistle as heard by an observer standing on the platform.