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Photoelectric Effect Doubt

Posted: Sat Oct 14, 2017 11:11 am
by RahilVaknalliDis3A
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?

Re: Photoelectric Effect Doubt

Posted: Sat Oct 14, 2017 12:41 pm
by Hazem Nasef 1I
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!

Re: Photoelectric Effect Doubt

Posted: Sat Oct 14, 2017 1:13 pm
by Camille Ng 1D
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

Re: Photoelectric Effect Doubt

Posted: Sat Oct 14, 2017 2:53 pm
by Vincent Kim 2I
Is it the number of photons or the energy of the photons that causes electrons to be ejected from the metal?

Re: Photoelectric Effect Doubt  [ENDORSED]

Posted: Sat Oct 14, 2017 8:31 pm
by Chem_Mod
It is the energy of the photon.

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