A photon is always considered to be: ________?
Correct answer: A. Moving with speed of light
- A. Moving with speed of light
- B. At rest
- C. In accelerated form
- D. Moving with speed of sound
Explanation
A photon is a quantum of electromagnetic radiation and travels at 3.0 x 10^8 m/s in vacuum, the speed of light. It is not at rest and does not travel at the speed of sound; students may choose rest by incorrectly treating a photon like an ordinary massive particle.
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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