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Light with a wavelength of 5.0 · 10-7 m strikes a surface that requires 2.0 ev to eject an electron. Calculate the energy, in joules, of one incident photon at this frequency.

_____ joules

Respuesta :

Answer:The energy, in joules, of one incident photon at this frequency[tex]3.97\times 10^{-19} Joules[/tex].

Explanation:

The wavelength of the light = [tex]\lambda =5.0\times 10^{-7} m[/tex]

Energy of a single photon is given by the expresssion:

[tex]E=\frac{hc}{\lambda }[/tex]

h = Planck's constant

c = speed of light

[tex]E=\frac{6.626\times 10^{-34} J.s\times 3\times 10^8 m/s}{5.0\times 10^{-7} m}=3.97\times 10^{-19} Joules[/tex]

The energy, in joules, of one incident photon at this frequency[tex]3.97\times 10^{-19} Joules[/tex].