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-

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− ...

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Standard XII

Physics

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Question

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?

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Solution

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

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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?

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?