Einstein's photoelectric equation is Ex =hf. In this equation, Ex refers to
Correct answer: C. maximum kinetic energy of emitted electrons
- A. kinetic energy of all the emitted electrons
- B. mean kinetic energy of emitted electrons
- C. maximum kinetic energy of emitted electrons
- D. minimum kinetic energy of emitted electrons
Explanation
In Einstein's photoelectric equation, Ex =hf, Ex represents the maximum kinetic energy of emitted electrons. This is the energy associated with the fastest electrons ejected from the metal surface in the photoelectric effect.Incorrect Options and Explanations: (a) kinetic energy of all the emitted electrons - The equation gives the maximum kinetic energy of one electron, not the sum for all emitted electrons. (b) mean kinetic energy of emitted electrons - The equation provides the maximum kinetic energy, not the mean kinetic energy. (d) minimum kinetic energy of emitted electrons - The equation provides the maximum kinetic energy, not the minimum kinetic 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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