A drone fitted with siren in flying dire...

A drone fitted with siren in flying directly away from the drone operator and towards a distant building at a speed of `15 m//s`. The siren produces sound of frequency 780 Hz. What is the frequency that the operator hears in the echo reflected from the building (Speed of sound is `340 m//s`).

766 Hz

800 Hz

816 Hz

840 Hz

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TARGET PUBLICATION-Sound-Exercise

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