An X-ray tube is similar to a cathode-ray tube. Electrons are accelerated to high speeds at one end of the tube. If they are moving fast enough when they hit the screen at the other end, they give up their energy as X-rays (a form of nonvisible light).
A. Through what potential difference should electrons be accelerated so that their speed is 1.00\% of the speed of light when they hit the other end of the tube?
B. What speed would this potential difference give to protons? Express your answer in {\rm m/s}.
C. What potential difference would be needed to give protons the same kinetic energy as the electrons?