This frequency is called the " threshold frequency ".
2.
EM radiation above a threshold frequency will get through-this is somewhere in the radio region.
3.
A photon above a threshold frequency has the required energy to eject a single electron, creating the observed effect.
4.
For any particular material, there is a threshold frequency that must be exceeded, independent of light intensity, to observe any electron emission.
5.
Is there a cheap material with a photoelectric threshold frequency in the blue-violet ( or near-ultraviolet ) range ? talk ) 20 : 57, 10 June 2012 ( UTC)
6.
Different points in the visual system have very different critical flicker fusion rate ( CFF ) sensitivities; the overall threshold frequency for perception cannot exceed the slowest of these for a given modulation amplitude.
7.
One photon of light above the threshold frequency could release only one electron; the higher the frequency of a photon, the higher the kinetic energy of the emitted electron, but no amount of light ( using technology available at the time ) below the threshold frequency could release an electron.
8.
One photon of light above the threshold frequency could release only one electron; the higher the frequency of a photon, the higher the kinetic energy of the emitted electron, but no amount of light ( using technology available at the time ) below the threshold frequency could release an electron.
9.
The sudden cut-off below the threshold frequency indicates that it isn't a continuous wave of light which is " energizing " the electrons, rather it is a single particle of light which is energizing a single electron; below the threshold frequency, no single photon has enough energy to excite the electron to leave its orbit.
10.
The sudden cut-off below the threshold frequency indicates that it isn't a continuous wave of light which is " energizing " the electrons, rather it is a single particle of light which is energizing a single electron; below the threshold frequency, no single photon has enough energy to excite the electron to leave its orbit.
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