When source of sound is moving toward the observer apparent wavelength of sound ____.

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.

If temperature of a medium increases velocity of sound ____ .

What term is used for sound box of the human?

The speed of sound in humid air is more than in dry air, why? Will the speed of sound in humid hydrogen be more than that in dry hydrogen?

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