In a tv tube, the picture is created by a beam of electrons that raveks diwb the tube at a very high speed. What is the mass of one of these electrons, compared with an electron at rest?
A- The mass of an electron appears to have a smaller mass
B-The moving of electron appears to have a smaller mass
C-the electron appears to have a greater mass if you are in front of the tube approaching you and a smaller mass if you are standing behind the tube moving away from you.
D- The moving electron appears to have greater mass.