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please answer this (multiple options are correct)
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Asked by Prashant DIGHE | 29 May, 2020, 10:16: PM
answered-by-expert Expert Answer
This question is based on the concept of doppler's effect.The velocity of both the vehicles are u. The velocity of wind is w. Frequency blown by source vehicle is f1 whereas frequency heard by the observer is f2.
I n space f i r s t space c a s e space l e t s space c o n s i d e r space t h e space w i n d space i s space b l o w i n g space f r o m space s o u r c e space t o space o b s e r v e r space s o space i n space t h a t space c a s e f subscript 2 equals f subscript 1 open parentheses fraction numerator V plus w plus u over denominator V plus w minus u end fraction close parentheses i n space s e c o n d space c a s e space w i n d space b l o w s space f r o m space o b s e r v e r space t o w a r d s space t h e space s o u r c e f subscript 2 equals f subscript 1 open parentheses fraction numerator V minus w plus u over denominator V minus w minus u end fraction close parentheses H e n c e space i n space b o t h space t h e space c a s e s space f subscript 2 greater than f subscript 1 A s space t h e space v e h i c l e s space a r e space a p p r o a c h i n g space w a c h space o t h e r space t h e space f r e q u e n c y space r e c i e v e d space i s space a l w a y s space g r e a t e r.
Hence a and b is the correct choice.
Answered by Utkarsh Lokhande | 30 May, 2020, 08:22: AM

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