Beat is produced when two waves of nearby frequencies superimpose when they travel in the same path. This causes a periodic variation of intensity of the resultant wave.
The beat frequency is the number of beats produced per second.
Beat Frequency Formula:
The formula for beat frequency is the difference in frequency of the two superimposed waves.
f1 and f2 are the frequency of two waves
Beat Frequency Problems
Problem 1: Compute the beat frequency if the two frequencies of waves are 750Hz and 380Hz respectively?
Given parameters are,
f2 = 800Hz and f1 = 400Hz
The beat frequency is given by,
fb = |f2−f1|
fb = |800−400|= 400Hz
Problem 2: Compute the beat frequency if the wave frequencies are 550Hz and 1000Hz respectively?
Known numerics are,
f1 = 550Hz and f2 = 1000Hz
Thus, the beat frequency is articulated by,
fb= |1000−550|= 450Hz