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

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At what speed should a source of sound move away from a stationary observer so that observer finds the apparent frequency equal to half of the original frequency?

When the source is moving towards the stationary listener, the expression for apparent frequency is

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

Apply the know values in the relation, we get

The frequency is,

$v_{s} = 2v$
$v_{s} = v$

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25. Intext examples V

Exercise condition: