Q. Beats are produced by two travelling waves each of loudness I and nearly equal frequencies $n_{1}$and $n_{2}$. The beat frequency will be …. and maximum loudness hard will be
A) $\left( n_{1} - n_{2} \right),$2$I$
B) $\left( n_{1} - n_{2} \right),$4$I$
C) $\left( n_{1} - n_{2} \right),$3$I$
D) $\left( n_{1} - n_{2} \right),I$
Explanation
(b) Beat frequency=number of beats $s^{- 1}$
$= n_{1} - n_{2}$
And maximum loudness $= (a + a)^{2} = 4a^{2} = 4I_{1}\ or\ 4I_{2} = 4I$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.