The energy of a photon is given by
Correct answer: D. hf
- A. mc²
- B. 1/2mv²
- C. mgh
- D. hf
Explanation
The energy of a photon (a particle of light) is given by the equation E=hf, where h is Planck's constant and f is the frequency of the light wave.Incorrect Options and Explanations: (a) mc² - This equation represents the rest energy of a particle with mass m moving at the speed of light (c), which applies to particles with mass, not photons. (b) 1/2mv² - This equation represents the kinetic energy of a particle with mass m and velocity v, which applies to particles with mass, not photons. (c) mgh - This equation represents the gravitational potential energy of an object with mass m at a height h above a reference point in a gravitational field, which is unrelated to photon energy.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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