- #1

sonutulsiani

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## Homework Statement

A car is approaching a reflecting wall. A stationary observer behind the car hears a sound of frequency 745 Hz from the car horn and a sound of frequency 863 Hz from the wall.

1. How fast is the car traveling?

A. 25.2 m/s

B. 33.4 m/s

C. 18.9 m/s

D. 54.2 m/s

2. The frequency of the car horn is

A. 690 Hz

B. 800 Hz

C. 804 Hz

D. 875 Hz

3. The frequency the car driver hears reflected from the wall is

A. 931 Hz

B. 804 Hz

C. 800 Hz

D. 926 Hz

I got 1 as 54.2 m/s but I am not sure about it. I don't know how to do the rest. Please help me out.