Intext examples IV — task. Science State Board, Class 10.

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A source and listener are both moving towards each other with a speed $v/10$ where $v$ is the speed of sound. If the frequency of the note emitted by the source is f, what will be the frequency heard by the listener?

When source and listener are both moving towards each other, the apparent frequency is

$n^{'} = (\frac{v - v_{s}}{v})$
$n^{'} = (\frac{v + v_{l}}{v - v_{s}}) . n$

Apply the know values in the relation, we get

The frequency heard by the observer is .

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24. Intext examples IV

Exercise condition: