An engine giving whistle is moving towar...

An engine giving whistle is moving towards a stationary observer with `110m//s` speed. What will be the ratio of the frequency of the whistle heard when the engine is approaching and receding from the observer (the speed of sound is `330 m//s`) ?

`2 : 1`

`1 : 2`

`3 : 1`

`5 : 2`

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