Question

Einstein explained the photoelectric effect by proposing that

Answer 1

Hi friend here is your answer

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that--various metals ejected electrons when light of specific or higher frequency was shown on their surface. 

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Answer 2

Answer :

Einstein explained the photoelectric effect by proposing that when beam of particle strike metals, electrons eject out with kinetic energy.

Einstein's explaination of photoelectric effect -

• Einstein used Planck's Quantum theory of electromagnetic induction to explain photoelectric effect.
• When the beam of particles (photons) of some energy strikes electron in the atom of a metal, the energy is transferred to the electron.
• As soon as, the photon particle strikes the electron and the the energy is transferred from the particle to the electron, the electron ejects out.
• Greater the energy in photon, greater will be transfer of energy, and greater will be the kinetic energy of ejected electron.
• So, kinetic energy of electron is proportional to the frequency of electromagnetic radiation.
• According to Planck's Quantum theory, E = hv.
• So, Kinetic energy transferred = hv - hv0. (Conservation of energy principle)
• Following this, Kinetic energy of ejected electron = h•v = h•v0 + ½•m_e•v².