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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?
![Screenshot 2022-03-02 133310.jpg](https://resources.cdn.yaclass.in/1ed0feac-419b-4450-8a72-36f5636a9037/Screenshot20220302133310w658.jpg)
When the source is moving towards the stationary listener, the expression for apparent frequency is
Apply the know values in the relation, we get
The frequency is,