The answer is false , because they move without an electromagnetic
The frequency of the wave has not changed.
In fact, the frequency of a wave is given by:

where v is the wave's speed and
is the wavelength.
Applying the formula:
- In air, the frequency of the wave is:

- underwater, the frequency of the wave is:

So, the frequency has not changed.
Yes, in general, metalloids are slightly reactive.
Any photos so i can help you with that?
For the first hour, the slope is zero.
After that, the slope is -2 miles per hour.