Answer:
fo = 378.52Hz
Explanation:
Using Doppler effect formula:

where
f' = 392 Hz
C = 340m/s
Vb = 20m/s
Va = 31m/s
Replacing these values and solving for fo:
fo = 378.52Hz
The distance from the Earth to the Sun is 92.96 million mi.
B. Impedes the flow of electrons
The answer is going to be leaves.
Answer:
In the picture.
Explanation:
I hope that it's a clear solution.