What is a photon?
A photon is a discrete particle of electromagnetic radiation.
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What is the equation linking photon energy (E), Plank's constant (h), and frequency (f)?
E = photon energy (J)
h = Plank's constant = 6.63 x 10-34 Js
f = frequency (Hz)
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What is the relationship between photon energy and frequency?
Photon energy is directly proportional to frequency.
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How do we convert from joules to electron-volts?
Divide the energy in Joules by the charge on an electron (1.6 x 10-19).
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What speed do photons travel at?
Photons travel at the speed of light in a vacuum (3 x 108 ms-1).
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What is the formula linking photon energy (E) and wavelength (λ)?
E = photon energy (J)
h = Plank's constant = 6.63 x 10-34 Js
c = speed of light in a vacuum = 3 x 108 ms-1
λ = wavelength (m)
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What is the formula linking photon momentum (p), energy (E) and speed of light (c)?
p = photon momentum (kg ms-1)
E = energy (J)
c = speed of light (ms-1)
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