In photoelectric effect, K.E. of an ejected electron depends upon the following property of light:
Correct answer: B. Frequency
- A. Intensity
- B. Frequency
- C. Wavelength
- D. None of these
Explanation
B is the correct answer. The key factor influencing the photoelectric effect is the frequency of the incident light. According to the photoelectric effect equation, E=hν, where E is the energy of a photon, h is Planck's constant, and ν is the frequency of the light. The kinetic energy of the ejected electrons is given by K.E.=hν−ϕ, where ϕ is the work function. The higher the frequency of the incident light, the greater the kinetic energy of the ejected electrons.
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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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