Kinetic Energy  [ENDORSED]

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BriannaParrington-1B
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Joined: Fri Apr 06, 2018 11:04 am

Kinetic Energy

Postby BriannaParrington-1B » Sun Apr 15, 2018 8:30 pm

Is the concept of kinetic energy is the excess energy after a light hits a metal surface and the energy required to eject electron(s) using the light (photons) is more than needed?

Lily Emerson 1I
Posts: 27
Joined: Fri Apr 06, 2018 11:02 am

Re: Kinetic Energy

Postby Lily Emerson 1I » Sun Apr 15, 2018 8:42 pm

pretty much! the kinetic energy is just the energy that the electrons have from the photons after they've been knocked off the metal.

jadam_1E
Posts: 30
Joined: Fri Apr 06, 2018 11:01 am

Re: Kinetic Energy  [ENDORSED]

Postby jadam_1E » Sun Apr 15, 2018 8:53 pm

Is the concept of kinetic energy is the excess energy after a light hits a metal surface and the energy required to eject electron(s) using the light (photons) is more than needed?

The kinetic energy of the ejected electron is equal to the energy of the photon - the threshold energy (also known as the work function)) which is the minimum amount of energy required to eject an electron from a sheet of metal. If the photon does not have enough energy to eject the electron, then the electron will not have any kinetic energy because it will never have been ejected. The kinetic energy is basically the amount of energy left over after the photon has lost energy because of ejecting the electron. The electron being ejected receives all of the photon's energy so if the photon's initial energy is greater than the threshold energy, the electron will have kinetic energy.


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