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please answer this (multiple options are correct)

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Asked by Prashant DIGHE 2nd June 2020, 9:44 PM
Answered by Expert
Answer:


Two loud speakers are 20m apart and emits ounds of frequency 118Hz and 121Hz...
f subscript M equals 118 open parentheses fraction numerator V plus V subscript 0 C o s theta over denominator V end fraction close parentheses
f subscript N equals 121 open parentheses fraction numerator V plus V subscript 0 C o s theta over denominator V end fraction close parentheses
B e a t s space equals f subscript M minus f subscript N
B e a t s space equals 3 open parentheses fraction numerator V plus V subscript 0 C o s theta over denominator V end fraction close parentheses
A s space v e h i c l e space m o v e s space c l o s e r space theta I n c r e a s e s space a n d space C o s theta space d e c r e a s e s space h e n c e space b e a t s space w i l l space d e c r e a s e


R a t e space o f space c h a n g e space o f space b e a t space f r e q u e n c y space i s space
fraction numerator d B over denominator d theta end fraction equals 3 open parentheses V subscript 0 over V left parenthesis negative S i n theta right parenthesis close parentheses
I t s space m a x i m u m space w h e n space S i n theta equals 1 space h e n c e space theta equals 90 to the power of 0 space
S o space m a x i m u m space a t space Q

V subscript p space equals 3 open parentheses fraction numerator V plus V subscript 0 C o s theta over denominator V end fraction close parentheses
V subscript R space equals 3 open parentheses fraction numerator V minus V subscript 0 C o s theta over denominator V end fraction close parentheses
V subscript p space plus V subscript R equals 6
A t space Q comma 121 minus 118 equals 3 h z
S o
V subscript Q equals 3

V subscript p space plus V subscript R equals 2 V subscript Q
Option B,C and D are correct
Answered by Expert 3rd June 2020, 11:31 AM
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Tags: sound-waves
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