Einstein's Equation


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Sean Sugai 4E
Posts: 56
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?

kpang_4H
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
Posts: 109
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.

Michael Sun Dis 3G
Posts: 35
Joined: Wed Sep 30, 2020 9:37 pm

Re: Einstein's Equation

Postby Michael Sun Dis 3G » Thu Oct 22, 2020 7:03 pm

It basically just says that if the energy of the photon is larger than the work function (the energy it takes to remove the electron), that excess will be converted into kinetic energy of the ejected electron. The equation helps to support the idea that light is also a particle, as only photons of large enough energy can eject electrons.

George_Yin_3I
Posts: 34
Joined: Wed Sep 30, 2020 9:42 pm

Re: Einstein's Equation

Postby George_Yin_3I » Fri Oct 23, 2020 10:17 pm

The function means that the kinetic energy of electrons ejected from the metal is equal to the kinetic energy of the photons in total minus the work function of the energy.

605291562
Posts: 36
Joined: Wed Sep 30, 2020 10:07 pm

Re: Einstein's Equation

Postby 605291562 » Sun Oct 25, 2020 4:06 pm

They found out from the photoelectric experiment that the kinetic energy of the ejected electrons equals the energy of the photon minus the work function

Edwin Liang 2I
Posts: 28
Joined: Wed Sep 30, 2020 9:34 pm

Re: Einstein's Equation

Postby Edwin Liang 2I » Sun Oct 25, 2020 5:30 pm

The equation Ek = HV - Φ represents the kinetic energy of the ejected electron. This is determined by finding the initial energy of the photon subtracting the threshold energy of the metal, which is the minimum energy required to eject an electron from the metal.


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