Distinction between interference and beats - class-XI

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Multiple Choice

Two sound sources are moving in opposite direction with velocity $v _1$ and $v _2$ $(v _1>v _2)$. Both are moving away from a stationary observer.the frequency of both the source is $900\ Hz$. What is the value of $v _1 - v _2 $  so that the beat frequency observed will be $6\ Hz$  ?


Speed of sound =$300\ ms^{-1}$

  1. $1\ ms^{-1}$
  2. $4\ ms^{-1}$
  3. $3\ ms^{-1}$
  4. $2\ ms^{-1}$
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