(i) prakash is not able to hear because reverberation of sound. because of reverberation he hears the sound more times than one and its like a no. of people are shouting in front of you then u can not hear waht they are saying
(ii) (a) move the TV to another room. which is small.
(b) use the material like in theaters the seat and the wall is covered with special material which absorbs the sound.
I THINK IT'S ENOUGH.
HAVE A NICE DAY......