## Units for E [ENDORSED]

$E=hv$

Labiba Sardar 2A
Posts: 86
Joined: Sat Jul 20, 2019 12:15 am

### Units for E

Is the unit for E always implied as being J/atoms or J/photons?

Ryan Yee 1J
Posts: 61
Joined: Sat Aug 17, 2019 12:16 am

### Re: Units for E  [ENDORSED]

Since this equation applies to light, it would be J/photon.

Maeve Miller 1A
Posts: 51
Joined: Fri Aug 09, 2019 12:16 am

### Re: Units for E

Yes, energy is measured in joules (E); for most problems, you'll answer with J/photon, but in problems asking for the energy per atom, you'll need to multiply by Avogadro's number and answer in J/atom.

VPatankar_2L
Posts: 89
Joined: Thu Jul 25, 2019 12:17 am
Been upvoted: 1 time

### Re: Units for E

Energy in the situations that discuss light is considered as J/photon. If the energy is provided in eV (electron Volts), you will have to convert it to J/photon. The conversion factor is about 1 eV = 1.6 *10^-19 J/photon.

PGao_1B
Posts: 50
Joined: Sat Jul 20, 2019 12:15 am

### Re: Units for E

The unit for E is always implied as being J / photons, but if you want to convert to J / atoms, you must use Avogadro's number.