Light with a wavelength of 3.00 × 102 nm is abosrbed by a certain metal, which t

Question

Light with a wavelength of 3.00 × 102 nm is abosrbed by a certain metal, which then emits an electron.

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Map Light with a wavelength of 3.00 x102 nm is abosrbed by a certain metal, which then emits an electron. Answer the three questions below, using three significant figures. Part A: How much energy (Ei) does each photon of the light carry? Number eV Part B: The maximum kinetic energy of the emitted electrons is found to be 1.50 eV. What is the value of the work function () for the metal? Number eV

Explanation / Answer

According to these questions ;

A)

=Ei =hc/lamda

=6.625*10^-34*3*10^8/3.00*10^2*10^-9m

=6.625*10^-19J

Then,

We know that:

=1eV =1.6*10^-19J

So,

=Ei =4.140eV

B)

The maximum kinetic energy of the electron is;

KEmax =Ephton -fi

Then,

=hc/lamda -KEmax

Then,

=4.140eV -1.50eV

So the value of work function (fi) for the metal is ;

=2.640eV

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