A police car with a siren of frequency 8...

A police car with a siren of frequency `8 KHz` is moving with uniform velocity `36 Km//hr` towards a ball building which reflects the sound waves. The speed of sound in air is `320 m//s`. The frequency of the siren heard by the car driver is

8.5 kHz

8.25 kHz

7.25 kHz

7.5 kHz

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