Two sounding bodies producing prograssive waves given by ` y_1 =4 sin (400 pit ) and y_2 3sin ( 404 pit ) `,are situated very near to the ears of a person.He will hear (Here intensity ratio is between maxima and minima )
A. 2 beats per second with intensity ratio 49/1
B. 4 beats per second with intensity ratio 49/1
C. 2 beats per second with intensity ratio 7/3
D. 4 beats per second with intensity ratio 4/3
