How far can you go until you reach space?

What is the relationship between the wavelength of a wave and it's energy?

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.

Whenever the net force on a moving object is zero its acceleration is