## Finding the Energy of A Photon

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

Johanna Caprietta 1E
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

### Finding the Energy of A Photon

Some of the homework problems asked to calculate the energy of a photon and I am confused on how to do that. Is there a formula needed to solve for that?

Priscilla Okaiteye
Posts: 61
Joined: Tue Nov 21, 2017 3:02 am

### Re: Finding the Energy of A Photon

Depending on the type of question this could be very simple. If you are given enough information in the question just use the formula E=hv. That would be the energy of the photon is equal to the frequency times Plank's constant.

Ellie Tsang 1I
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am
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### Re: Finding the Energy of A Photon

If you remember the equations like E=hv and c=λv, you can manipulate the energy equation to find the energy of a photon. For example, E is also equal to hc/λ .

Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

### Re: Finding the Energy of A Photon

The following formula can be also used to find the energy of a photon:
Ephoton = Eenergy remove electron + Eexcess

Ephoton = hv [*]where h is planck's constant and v is frequency
Eenergy remove electron is also called the work function or the threshold energy
Eexcess = (1/2)mv2 [*][*]where v is velocity

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