Question

A stationary police car emits a sound of frequency 1200 Hz that bounces off of a car on the highway and returns with a frequency of 1260 Hz. The police car is right next to the highway, so the moving car is traveling directly toward or away from it.

A) True
B) False

Answer 1

The frequency of the sound wave that is heard by the stationary police car is lower than the frequency of the sound wave emitted by the police car. This is because the moving car is traveling towards the police car, causing the sound waves to be compressed and the frequency to increase. Therefore, the statement is true.

Step-by-step explanation:

The frequency of the sound wave that is heard by the stationary police car is lower than the frequency of the sound wave emitted by the police car. This is because the moving car is traveling towards the police car, causing the sound waves to be compressed and the frequency to increase. When the sound waves bounce off the car and return to the police car, the frequency is further increased due to the car moving away. Therefore, the statement is True.