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Energy-Frequency Relation
Energy-Frequency Relation
Energy is directly proportional to frequency, defined by E = h x frequency.
Energy-Wavelength Relation
Energy-Wavelength Relation
Energy is inversely proportional to wavelength, defined by E = h x c / wavelength.
Planck's Constant (h)
Planck's Constant (h)
A constant that relates the energy of a photon to its frequency, approximately 6.626 x 10^-34 J⋅s.
Electron Volt (eV)
Electron Volt (eV)
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Photoelectric Effect
Photoelectric Effect
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Study Notes
- Energy equals Planck's constant multiplied by frequency.
- Energy also equals Planck's constant multiplied by the speed of light, divided by wavelength.
- Planck's constant is provided in exams.
- Electron volt (eV) is the energy gained by an electron traveling through a potential difference of one volt.
- The kinetic energy of an electron accelerating from rest equals e V, which also equals 1/2 m v squared.
- Frequency and energy have a directly proportional relationship.
- Wavelength and energy have an inversely proportional relationship.
- The photoelectric effect occurs when metals absorb electromagnetic radiation and emit photoelectrons from their surface.
- The photoelectric effect is evidence that light is carried in discrete packets.
- Each electron can absorb a single photon.
- Only light frequencies above the threshold frequency will emit photoelectrons.
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Description
The photoelectric effect occurs when metals absorb electromagnetic radiation and emit photoelectrons. The effect is evidence that light is carried in discrete packets. Only light frequencies above the threshold frequency will emit photoelectrons.
