Question

if two tuning forks have frequencies "250 and 256 hz" respectively, then on sounding together , the time interval between two successive minimum amplitude will be
(a) 6 s (b) 3 s (c) 1/3 s (d) 1/6 s

Answer 1

a frequency of 250 Hz, means one peak of sound is separated by another for a time period of 1/250 sec

similarly for other frequency it is 1/256 sec

so the time interval between two consecutive beat is the difference between time period of both frequencies.

that is 1/256 - 1/250