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Photoelectric effect and frequency

  • Thread starter briteliner
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Homework Statement



the wavelengths of visible light range from about 380 nm to 750 nm. what is the range of photon energies (in eV) in visible light? a typical fm radio station's broadcast frequency is about 100Mhz. what is the energy of an FM photon of the frequency?

Homework Equations


eVo=hf-(phi)
phi=hfo
i don't know how to get fo which is the threshold frequency. thats the only part im stuck with


The Attempt at a Solution


i don't know how to get fo which is the threshold frequency.
 

Answers and Replies

  • #2
gabbagabbahey
Homework Helper
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The energy of a photon of frequency [itex]f[/itex] is given by [itex]E=hf[/itex].

[itex]eV_0=hf-hf_0[/itex] allows you to determine the difference in electric potential necessary to make electrons in a material with a threshold frequency [itex]f_0[/itex] to emit photons of frequency [itex]f[/itex]. This equation is useless to you here. You are simply asked to determine the energies of photons of a given wavelength or frequency.
 

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