Shaalaa.com | Doppler effect in sound
A set of 12 tuning forks is arranged in order of increasing frequencies. Each fork produces
‘Y’ beats per second with the previous one. The last is an octave of the first. The fifth fork
has a frequency of 90 Hz. Find ‘Y’ and frequency of the first and the last tuning forks.
A sonometer wire is in unison with a tuning fork of frequency 125 Hz when it is stretched by a weight. When the weight is completely immersed in water, 8 beats are heard per second. Find the specific gravity of the material of the weight.
Let n1 and n2 be the two slightly different frequencies of two sound waves. The time interval between waxing and immediate next waning is ______.
A train blows a whistle of frequency 640 Hz in air. Find the difference in apparent frequencies of the whistle for a stationary observer, when the train moves towards and away from the observer with the speed of 72 Km!hour. [Speed of sound in air == 340 m/s.]