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The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ????0 . Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 2.47×1014 s−1. g

Respuesta :

mavila18

Answer:

E = 0.965eV

Explanation:

In order to calculate the minimum energy needed to eject the electrons you use the following formula:

[tex]E=h \nu[/tex]        (1)

h: Planck' constant = 6.626*10^{-34}J.s

v: threshold frequency = 2.47*10^14 s^-1

You replace the values of v and h in the equation (1):

[tex]E=(6.262*10^{-34}J.s)(2.47*10^{14}s^{-1})=1.54*10^{-19}J[/tex]

In electron volts you obtain:

[tex]1.54*10^{-19}J*\frac{6.242*10^{18}eV}{1J}=0.965eV[/tex]

The minimum energy needed is 0.965eV

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