Sound Test - 27...

Perforated card boards are used in halls, for

In an auditorium, when a speech is going on, a window is opened beside the audience, then the absorption of sound :

Waves from sitar wire and veena wire distinguished by (of same frequency)

A man stands in front of a hillock and fires a gun. He hears an echo after 1.5 sec. The distance of the hill from the man is  (velocity of sound in air=330m/s)  

If velocity of sound in air is 340 $$m  s^{-1}$$, calculate wavelength when frequency is 256 Hz :

When we change feeble sound to loud sound we increase its :

A person is in front of a vertical mountain fires a bullet and hears its echo after a time 6s. The person walks a distance d towards mountain then fires another bullet and hears its echo after a time 2s. If velocity of sound in air is 340 ms$$^{-1}$$. The value of d is

In order to reduce the loudness of a sound we have to:

In the curve, half the wavelength is

The loudness of sound depends on: