Qstnid -10- Light Of Frequency 7.21 × 10<sup>14</sup> Hz Is Incident On A Metal Surface. Electrons With A Maximum Speed Of 6.0 × 10<sup>5</sup> M/s Are Ejected From The Surface. What Is The Threshold Frequency For Photoemission Of Electrons? - 11: Dual Nature Of Radiation And Matter - Neet-xii-physics

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NEET-XII-Physics

11: Dual Nature Of Radiation And Matter

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#10
Light of frequency 7.21 × 10¹⁴ Hz is incident on a metal surface. Electrons with a maximum speed of 6.0 × 10⁵ m/s are ejected from the surface. What is the threshold frequency for photoemission of electrons?

Ans : Frequency of the incident photon,

Maximum speed of the electrons, v = 6.0 × 10⁵ m/s

Planck’s constant, h = 6.626 × 10^-34 Js

Mass of an electron, m = 9.1 × 10^-31 kg

For threshold frequency ν₀, the relation for kinetic energy is written as:

Therefore, the threshold frequency for the photoemission of electrons is