The velocity of the photon____________________?
Correct answer: A. Is independent of wavelength
- A. Is independent of wavelength
- B. Depends upon source
- C. Depends upon its frequency
- D. Equals to the square of amplitude
Explanation
In a vacuum, every photon travels at the constant speed of light, c, regardless of its wavelength or frequency. Its wavelength and frequency change according to c = wavelength x frequency, but their product remains constant. Students may choose c by confusing photon energy, E = hf, with photon velocity.
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About Planck's Quantum Theory
Planck's quantum theory states that energy is emitted or absorbed in discrete packets called quanta, with each packet having energy E = hν. It covers the meaning of Planck's constant, the relationship between frequency and wavelength, and how quantisation differs from the classical continuous model of energy.
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