Questions: A police car is speeding north with its siren blaring. The sound waves from the siren increase in frequency a north of the car. b south of the car. c in all directions around the car. d none of the above

A police car is speeding north with its siren blaring. The sound waves from the siren increase in frequency a north of the car. b south of the car. c in all directions around the car. d none of the above
Transcript text: A police car is speeding north with its siren blaring. The sound waves from the siren increase in frequency a north of the car. b south of the car. c in all directions around the car. d none of the above
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Solution

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Solution Steps

Step 1: Understanding the Doppler Effect

The Doppler Effect refers to the change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave. When the source of the sound is moving towards an observer, the frequency appears to increase (higher pitch), and when it is moving away, the frequency appears to decrease (lower pitch).

Step 2: Analyzing the Scenario

In this scenario, a police car is moving north with its siren on. The question asks about the change in frequency of the sound waves in different directions relative to the car.

Step 3: Applying the Doppler Effect
  • North of the car: The car is moving towards this direction. According to the Doppler Effect, the frequency of the sound waves will increase for an observer located north of the car.
  • South of the car: The car is moving away from this direction. The frequency of the sound waves will decrease for an observer located south of the car.
  • In all directions around the car: The frequency does not increase in all directions; it only increases in the direction the car is moving towards.

Final Answer

The correct answer is: \(\boxed{\text{a north of the car}}\)

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