U2.5-2.6 Photoelectric Emissions, Energy Levels And Wave Particle Duality Flashcards

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1
Q

What is a photon

A

A packet of electromagnetic energy

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2
Q

What are the equations for photon energy

A

E = h f
E = h c / lambda

h = planks constant
c = speed of light in a vacuum
f = frequency of the radiation
Lambda = wavelength of the radiation

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3
Q

What is photoelectric emission

A

Electrons are ejected from the surface of a metal when electromagnetic radiation (usually visible or UV) of sufficiently high energy falls on it.

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4
Q

What is the equation for photoelectric emission

A

Energy of incident photon = work function of metal surface + maximum KE of emitted photoelectrons

hf = hf0 + 1/2 m (vmax)2

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5
Q

What is the definition of the work function of a surface

A

The minimum energy needed to liberate an electron from the surface

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