Image from a far away object formed by a concave mirror
I have no idea but this is my best guess as a sophomore in college
Valleys, waterfalls, flood plains, meanders, and oxbow lakes
The frequency of the wave is 6800 Hz
<u>Explanation:</u>
Given:
Wave number, n = 20
Speed of light, v = 340 m/s
Frequency, f = ?
we know:
wave number = 

Therefore, the frequency of the wave is 6800 Hz
The air pressure is most likely lower.
Answer:
the answer is static electricity