Which one of the following statements on photoelectric effect is NOT c

Which one of the following statements on photoelectric effect is NOT correct ?

[amp_mcq option1=”Albert Einstein received the Nobel Prize in Physics for explaining photoelectric effect” option2=”For each metal, there is a threshold frequency v₀ below which this effect is not observed” option3=”At a frequency v > v₀, the kinetic energy of ejected electrons does not change on increasing the frequency of incident light” option4=”The number of electrons ejected is proportional to the intensity of incident light” correct=”option3″]

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UPSC CAPF – 2020

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The statement “At a frequency v > v₀, the kinetic energy of ejected electrons does not change on increasing the frequency of incident light” is NOT correct.

According to Einstein’s explanation of the photoelectric effect, the maximum kinetic energy (KE_max) of the ejected electrons is given by KE_max = h(v – v₀), where h is Planck’s constant, v is the frequency of incident light, and v₀ is the threshold frequency. This equation shows that for v > v₀, the maximum kinetic energy is directly proportional to the frequency of the incident light; increasing v leads to increased KE_max.

Statement A is correct; Einstein received the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect. Statement B is correct; a minimum frequency (threshold frequency) is required for electron emission. Statement D is correct; the number of emitted electrons is proportional to the intensity of the incident light (for v > v₀), as higher intensity means more photons striking the surface.

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