In which of the following will you (the observer) hear a HIGHER frequency than w

Question

In which of the following will you (the observer) hear a HIGHER frequency than what the source is emitting? Choose all that apply.

_____A police car with its siren on is moving towards you while traveling 110 mph. You are moving away from it while traveling 100 mph.
______A fire truck with its siren on is circling you. You are stationary.
_____ An ambulance with its siren on is moving away from you while traveling 90 km/h. You are moving towards it while traveling 90 km/h.
______A train with its horn blaring is stationary. You are stationary.
______A marching band playing the 1812 Overture is moving towards you while traveling 90 ft/s. You are moving away from it while traveling 100 ft/s

Explanation / Answer

_A police car with its siren on is moving towards you while traveling 110 mph. You are moving away from it while traveling 100 mph.

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