Notesale: Turn your study into money

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• Finally, a very low intensity beam of light carries little energy
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This would cause a delay in its emission
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The energy of one such quantum is given by:
where

is the frequency of the electromagnetic radiation and

is a constant, known as Planck's constant
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The electron will have to spend an energy to free itself from the pull of the nuclei of the atoms of the photo-surface
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The kinetic energy of the free electron is the difference
The work function
metal
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This is the minimum amount of energy needed to "knock" an electron from the

, the work function equals the critical frequency
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This is called duality of matter
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To show wave-like properties means to show wave phenomena such as diffraction and interference
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It is preferable to use
Also remember that

for kinetic energy
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Davisson and Lester H
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In the
Davisson-Germer experiment, electrons of kinetic energy 54
were directed at a surface of nickel where a single crystal had been grown and were scattered
by it
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The path difference between
successive scattered electrons is
When this is an integer multiple of the wavelength, we have constructive interference (same as Topic 9 for
diffraction grating)
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The total energy of the electron-positron system will be converted into the energy of two photons
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The longest wavelength will be emitted when the particles are at rest, so


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A single photon can make
use of a nearby nucleus to produce a particle-anti-particle pair
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This process of pair creation,
where energy is converted into matter
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The total energy

of the orbiting electron is:

But the electron is acted upon by the electric force, so

becomes
Bohr made the assumption that the angular momentum of the orbiting electron is quantised
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is the number of the state

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