Answers to the problems about the doppler effect

ANSWERS

1.1 648 Hz
1.2 559 Hz
2. 38 m•s-1
3. Need to ride away from friend; 16 m•s-1
4.1 432 Hz
4.2 429 Hz
5. No need to jump; car is moving away from person.
6. 16,8 m•s-1
7. 1008 Hz; L = 0,34 m
8. 860 Hz (No Doppler effect)
9.1 424 Hz
9.2 420 Hz
10. 2 121 Hz

amn