### How does E = hv lead to Einsteins equation E=MC2?

Posted:

**Sun Jul 09, 2017 5:35 pm**I'm really curious about the history of the Einstein equation... what's the difference between E = HV and the famous equation E = mc*2?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=15&t=21372

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Posted: **Sun Jul 09, 2017 5:35 pm**

I'm really curious about the history of the Einstein equation... what's the difference between E = HV and the famous equation E = mc*2?

Posted: **Sun Jul 09, 2017 7:24 pm**

I think the equations E=hv (mu) and E=mc^{2} may be solving for two different energies.

E=hv refers to the energy of a photon with respect to Planck's and frequency

E=mc^{2} uses the mass of an object and the speed of light.

The first relates the energy of a photon (which doesn't have mass) while the second relates the energy of an object with mass.

E=hv refers to the energy of a photon with respect to Planck's and frequency

E=mc

The first relates the energy of a photon (which doesn't have mass) while the second relates the energy of an object with mass.

Posted: **Tue Oct 10, 2017 12:25 pm**

Can someone explain the theory behind these equations? I don't understand what the photon energy is used to represent or what chemistry theories are represented.

Posted: **Tue Oct 10, 2017 1:19 pm**

Let's make two energies equal to each other:

mc^2 = hv

mc^2 = hc/lambda

speed of light cancels out

mc = h/lambda

lambda = h/mc This is De Brogli equation. So, overall, E=hv refers to light as a wave, while E=mc^2 refers to light as particles. Together they represent the wave-particle duality theory.

mc^2 = hv

mc^2 = hc/lambda

speed of light cancels out

mc = h/lambda

lambda = h/mc This is De Brogli equation. So, overall, E=hv refers to light as a wave, while E=mc^2 refers to light as particles. Together they represent the wave-particle duality theory.

Posted: **Tue Oct 10, 2017 1:23 pm**

Magdalena Palavecino wrote:Can someone explain the theory behind these equations? I don't understand what the photon energy is used to represent or what chemistry theories are represented.

E = hv or better seen on the computer as hf (Plancks equation) shows that if the frequency of a wave (light) increases, the amount of energy it has also increases. Through data and calculation, Planck found the relationship to be by a factor of h, 6.626x10^-34z.

Through this, we can find the energy of all waves, including electrons, which leads to orbitals and energy states in chemical bonding.

E =mc^2 states that all mass has energy by a factor of the speed of light squared, and all energy has a mass. Energy is kg(m/s)^2, thus energy is the mass times speed squared of an object. To my understanding, this is the maximum energy a mass can be converted to, and since no mass can achieve speeds beyond the speed of light, that is the maximum energy a given mass can have.

I hope that helps and isnâ€™t too confusing