Photoelectric Effect Doubt  [ENDORSED]

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RahilVaknalliDis3A
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Photoelectric Effect Doubt

Postby RahilVaknalliDis3A » Sat Oct 14, 2017 11:11 am

Is the intensity of the radiation the rate at which photons arrive and hit the metal or is it the number of photons present as a result of the amplitude of light?

Hazem Nasef 1I
Posts: 51
Joined: Tue Oct 10, 2017 7:13 am

Re: Photoelectric Effect Doubt

Postby Hazem Nasef 1I » Sat Oct 14, 2017 12:41 pm

The intensity of the light is essentially the amplitude. Increasing the intensity increases the number of photons hitting the metal.

Originally, it was expected that if a certain intensity of UV light didn't remove electrons from the metal, then increasing the intensity of the light (or number of photons hitting the metal) would cause electrons to be removed. However, that was not the case. Instead, they found that only increasing the energy of each individual photon (i.e. using higher frequency light) caused electrons to be removed from the metal.

Hope this helps!

Camille Ng 1D
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Joined: Thu Jul 27, 2017 3:01 am

Re: Photoelectric Effect Doubt

Postby Camille Ng 1D » Sat Oct 14, 2017 1:13 pm

The intensity means the number of photons, when talking about light in terms of waves. It's the equivalent of the amplitude in the particle model of light

Vincent Kim 2I
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Re: Photoelectric Effect Doubt

Postby Vincent Kim 2I » Sat Oct 14, 2017 2:53 pm

Is it the number of photons or the energy of the photons that causes electrons to be ejected from the metal?

Chem_Mod
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Re: Photoelectric Effect Doubt  [ENDORSED]

Postby Chem_Mod » Sat Oct 14, 2017 8:31 pm

It is the energy of the photon.

See this post for more information:
viewtopic.php?f=14&t=22229


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