Electrons are from the surface of a metal when it\'s expected to light. This is

Question

Electrons are from the surface of a metal when it's expected to light. This is called the Each metal has a certain frequency of light, below which nothing happens. Right of this frequency, an electron is above this frequency the electron is earned and the exits energy is transeferred to the electrons. The equation for this is where KE in the energy of the emitted electron, h = 6.63 Times 10^-34 J.s in placke's constant v is the frequency of the light, and is the frequency of the metal. Also, since E = hv, the equation can also be written as KE = E - E where E is the energy of the light and E is the energy of the metal. What is the frequency of return

Explanation / Answer

Cesium work function Wo = 2.1 eV

e =1.6x10^-19 C, h =6.63x10^-34 J.s

For thresholf frequency maximum kinetic eenrgy Kmax = 0

From Einstein Photo electric effect

E = Wo+Kmax

E =Wo =2.1 eV

hfo = 2.1x1.6x10-19J

fo = (2.1x1.6x10-19)/(6.63x10-34)

Threshold frequency fo = 5.068x1014 Hz

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