The Rest Energy of an Electron Is 0

question 14

Multiple Choice

The rest energy of an electron is 0.511 MeV,and its rest mass is 0.511 MeV/c². If an electron has a speed of 99% that of light,what fraction of its total energy is in the form of kinetic energy?

• A)76%
• B)50%
• C)68%
• D)86%

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Definitions:

Camera

A device for capturing visual images in the form of photographs, video recordings, or digitally.

Retina

The retina is the light-sensitive layer of tissue at the back of the eye, which detects light and converts it into neural signals for processing by the brain.

Absolute Threshold

The minimum level of stimulus intensity needed for a person to detect its presence at least half the time.

Color Vision

The ability of the eye and brain to perceive differences in wavelengths of light as differing colors.