Which of these are not mechanical waves and can be used to send a signals to satellites orbiting the earth?

c

explanation:

i believe the answer is c and this is only worth 10 points you might wanna change it

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

that the claims meet official rules.

don't misinterpret the claims