important part of photoelectric effect

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705379941
Posts: 52
Joined: Fri Aug 30, 2019 12:16 am

important part of photoelectric effect

Postby 705379941 » Fri Nov 01, 2019 9:28 pm

What is the must know for the photoelectric effect?

Deepika Reddy 1A
Posts: 125
Joined: Thu Jul 11, 2019 12:15 am

Re: important part of photoelectric effect

Postby Deepika Reddy 1A » Fri Nov 01, 2019 9:45 pm

There is a photon of light that comes in with a certain energy and hits a metal surface, causing an electron to be ejected. The kinetic energy of this electron is detected by a separate device. It is important to know how to calculate the energy of the incoming photon, the work function (the minimum amount of energy it takes to get the electron to eject), and the kinetic energy of the ejected electron. Also, know how these three things relate and how to find one if you have the other two.

Claire Grover 3G
Posts: 64
Joined: Wed Sep 18, 2019 12:18 am

Re: important part of photoelectric effect

Postby Claire Grover 3G » Fri Nov 01, 2019 10:18 pm

I think it is also really important that the photoelectric effect displays the photon properties of light, rather than the wave properties of light.

BNgo_2L
Posts: 95
Joined: Wed Sep 11, 2019 12:17 am

Re: important part of photoelectric effect

Postby BNgo_2L » Fri Nov 01, 2019 10:23 pm

Yes, the main demonstration of the photoelectric effect is to explain that light doesn't act like a classical wave when it is emitted as a particle (photon).

WYacob_2C
Posts: 102
Joined: Sat Jul 20, 2019 12:16 am

Re: important part of photoelectric effect

Postby WYacob_2C » Sat Nov 02, 2019 3:33 pm

It's important to know that
the energy of a photon - threshold energy = electron's kinetic energy.

DHavo_1E
Posts: 118
Joined: Sat Aug 17, 2019 12:17 am

Re: important part of photoelectric effect

Postby DHavo_1E » Sun Nov 03, 2019 7:27 pm

Hi,

I would like to add that at first light was seen as a wave which led scientists to believe that increasing intensity would increase energy and thus release more electrons (such as how a big wave at the beach has more energy than a small wave as Dr. Lavelle said). However, it was found that increasing intensity did not result in ejected electrons. Consequently, the photon model developed in which it was found that a certain frequency was needed to eject electrons. In this model, light was seen as being made of photons that with the right frequency (and hence energy) would eject electrons. Increasing intensity increased the number of photons, not energy.


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