All High School Physics Resources
Example Questions
Example Question #1 : Light And Electromagnetic Waves
Why is it that photons can move at the speed of light, but other particles cannot?
Possible Answers:
Photons contain more energy than other particles
Photons lack electrical charge
Photons do not have mass
Photons are similar in size to electrons
Correct answer:
Photons do not have mass
Explanation:
Photons can move at the speed of light because they have no mass. Anything with mass can not be accelerated to the speed of light—it takes an infinite amount of energy to do so. We can get very close, but never exactly there.
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