Question

A police car is moving at 30 m/s Eastward behind a large truck moving at 10 m/s in the same direction. The police siren has a natural frequency of 800 Hz. An observer is at rest between the police car and the truck. Find the beat frequency heard by:

A)The observer
B) The truck driver
C) The police officer

Answer 1

The beat frequency heard by the observer is 800 Hz.

Step-by-step explanation:

The beat frequency heard by an observer between the police car and the truck can be calculated by taking the difference between the frequencies of the police siren and the truck's engine. The beat frequency can be found using the formula:

Beat frequency = frequency of the police siren - frequency of the truck's engine

Since the police siren has a natural frequency of 800 Hz and the truck is moving at 10 m/s, which is the same frequency, the beat frequency heard by the observer is 800 Hz - 0 Hz = 800 Hz.