Question

5. a) What is an echo? What should be the minimum distance of the reflector from the source of a sharp sound of frequency 400 Hz moving with a wavelength of 0.75 m in a medium? b) What is reverberation? Deduce an expression for the reverberation time. c) Consider a hall of volume $V$ and surface area $s$. The reverberation time of the hall is $T_1$. After fixing an extra sound absorbing material of absorption coefficient $a_1$ and surface area $s_1$ inside the hall, the reverberation time changes to $T_2$. Find an expression for the absorption coefficient $a_1$ in terms of $V$, $s$, $s_1$, $T_1$ and $T_2$.

          5. a) What is an echo? What should be the minimum distance of the reflector from the source of a sharp sound of frequency 400 Hz moving with a wavelength of 0.75 m in a medium?
b) What is reverberation? Deduce an expression for the reverberation time.
c) Consider a hall of volume $V$ and surface area $s$. The reverberation time of the hall is $T_1$. After fixing an extra sound absorbing material of absorption coefficient $a_1$ and surface area $s_1$ inside the hall, the reverberation time changes to $T_2$. Find an expression for the absorption coefficient $a_1$ in terms of $V$, $s$, $s_1$, $T_1$ and $T_2$.

5. a) What is an echo? What should be the minimum distance of the reflector from the source of a sharp sound of frequency 400 Hz moving with a wavelength of 0.75 m in a medium?
b) What is reverberation? Deduce an expression for the reverberation time.
c) Consider a hall of volume V and surface area s. The reverberation time of the hall is T1. After fixing an extra sound absorbing material of absorption coefficient a1 and surface area s1 inside the hall, the reverberation time changes to T2. Find an expression for the absorption coefficient a1 in terms of V, s, s1, T1 and T2.

Added by Iker P.

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