Answer:
light doesn't need a medium through which to travel because the speed of light is experimentally constant
Answer:
power output/transformer efficiency multiply by 100%
Explanation:
derrive the formula from efficiency=power output/power input multiply by 100%
Answer:

Explanation:
q = Charge in the potassium ion = 
e = Charge of electron = 
= Change in potential = 
Change in electric potential is given by

The energy is 
There is many activities you can do like running, sit-ups, push-ups, and squats.
from shortest wavelength to longest:
Ultraviolet
visible
infrared
microwave
so the answer is B