What is the relation between the apparent frequency and true frequency of sound when the source and observer move towards each other along the same line ?

What is the relation between the apparent frequency and true frequency

1.	What is the relation between the apparent frequency and true frequency of sound when the source and observer move towards each other along the same line ?
Answer» SOLUTION :n (apparent)=n (true) x `((V+v_("observer"))/(v-v_("SOURCE")))`, where v is the speed of sound in still AIR.

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What is the relation between the apparent frequency and true frequency of sound when the source and observer move towards each other along the same line ?

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