In a TV Tube, the Picture Is Created by a Beam

question 169

Multiple Choice

In a TV tube, the picture is created by a beam of electrons that travels down 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 is measured to be the same regardless of how fast it is moving.
• B) The moving electron appears to have a smaller mass.
• C) The electron appears to have a greater mass if one is in front of the tube (electrons approaching) and a smaller mass if one is standing behind the tube (electrons moving away).
• D) The moving electron appears to have a greater mass.

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Definitions:

Depression

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