Einstein's Equation

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Sean Sugai 4E
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Joined: Wed Sep 11, 2019 12:17 am

Einstein's Equation

Postby Sean Sugai 4E » Sun Oct 13, 2019 8:44 pm

What does Ek=hv–Φ mean in terms of kinetic energy, electron ejection, intensity of the wave, and work function? Also, what interpretations were made from this equation regarding the photoelectric effect?

Posts: 55
Joined: Fri Sep 20, 2019 12:17 am

Re: Einstein's Equation

Postby kpang_4H » Sun Oct 13, 2019 8:54 pm

The photoelectric experiment consisted of shining light onto a metal surface to measure the energy needed to remove electrons from different metals. Kinetic energy is equal to energy of the photon minus the the energy to remove the electron (work function/threshold energy). This equation illustrates the concept of conservation of energy.

Lauren Tanaka 1A
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Joined: Sat Aug 17, 2019 12:18 am

Re: Einstein's Equation

Postby Lauren Tanaka 1A » Mon Oct 14, 2019 9:32 pm

The photoelectric effect is defined as E(Photon) - threshold E = Kinetic energy of the electron. In order for an electron to be ejected and have KE, the E(Photon) has to be greater than the threshold energy of the metal. If the E(Photon) and threshold energy are equal an electron will be removed but will have no KE.

Sam McNeill 1E
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

Re: Einstein's Equation

Postby Sam McNeill 1E » Wed Oct 16, 2019 4:32 pm

Try to think of it as whatever the difference between the energy of the photon absorbed and the energy actually needed to remove an electron results in the kinetic, left over energy of the photon pushing out the electron at different velocities.

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