A listener and a sound source are going with the same velocity in the same direction. What will be ratio of frequencies of source and frequency heard by listener?

Two bodies are thrown with the same velocity at an angle 30^@ and 60^@ to the horizontal. What is the ratio of maximum heights reached?

A closed and open organ pipe are tuned to the same frequency. What is the ratio of their lengths?

A source and an observer are approaching one another with the relative velocity 40m/s. If the true source frequency is 1200Hz, find the observed frequency under the following conditions : (I)All velocity is in the source alone (ii) All velocity is in the observer alone

Two bodies are thrown with same velocity at angle alpha and (90-alpha) with the horizontal. What is the ratio of their ranges ?

What is efficiency of an engine where source and sink are at same temperature ?

Derive an expression for the apparent frequencies when source and observer moving in the same direction.

A source of sound and an observer are stationary relative to each other. If the speed of sound changes, then which one, the frequency or the wave length of sound heard by the observer, will not change.

Two sirens at a distance apart are soundings with the same frequency, when a person standing between them runs towards one siren then he hears beats, Why?