Energy equation



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Jimmy lira-1G
Posts: 61
Joined: Fri Apr 06, 2018 11:03 am

Energy equation

Postby Jimmy lira-1G » Mon Apr 30, 2018 12:02 am

for
energy of photon -threshold = kinetic energy
if we have to solve for kinetic do we use
e= 1/2 mv^2 or do we just use energies that are gven in the problem ??


-Jimmy Lira- 1g

Mariah Guerrero 1J
Posts: 32
Joined: Fri Apr 06, 2018 11:03 am

Re: Energy equation

Postby Mariah Guerrero 1J » Mon Apr 30, 2018 12:07 am

If energies (E photon and work function) are given in the problem or you can solve for them, then you do not need to use the KE equation. Subtract the work function (also called the threshold energy or ionization energy) from E photon to find the KE. However, if only KE is asked with no other information to solve Ephoton or the work function, then it is correct to use the equation E=(1/2)mv^2.


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