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NEET Class neet Answered

please answer this (multiple options are correct)
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Asked by Prashant DIGHE | 02 Jun, 2020, 09:44: PM
answered-by-expert 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 Utkarsh Lokhande | 03 Jun, 2020, 11:31: AM

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