Class 11 NEET Physics Waves Questions Questions

Reverberation time, T=

0.61V

aS

where V is the volume of room in cubic metres, a is the average absorption coefficient of the room, S is the total surface area of room in square metres.
or, T∝

V

S

or,

T1

T2

=(

V1

V2

)(

S2

S1

) =(

V

8V

)(

4S

S

)=

1

2

or, T2=2T1=2×1=2 sec. (∵T1=1‌sec)