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A police siren emits a sinusoidal wave w...

A police siren emits a sinusoidal wave with frequency of 300 Hz. The speed of the sound is 340 m/s. If the siren is moving at a speed of 30 m/s, the wavelength of the waves ahead of the source is :

A

1.03 m

B

10.3 m

C

1.23 m

D

12.3 m

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