## Equations and their purpose

$E=hv$

Haley Fredricks 1B
Posts: 53
Joined: Sat Aug 24, 2019 12:16 am
Been upvoted: 2 times

### Equations and their purpose

I am a little confused on all of the equations in the unit so far. What are the classifications of each equation (like when you can use what)?

Anika Chakrabarti 1A
Posts: 102
Joined: Sat Aug 24, 2019 12:17 am

### Re: Equations and their purpose

The De Broglie equation (wavelength = h/p) can be used to find the wavelength of any moving particle with a momentum.

The equation E(n) = -[hR/n^2] can be used to find the energy of an electron at a certain energy level (n), and then you can calculate the change in energy if you know the initial and final energy level. You can also find the change in energy if you know the frequency by using E = hv. This equation can also be manipulated so that you can find the frequency of light if given the change in energy or the energy levels.

Most of the time, you just have to look at what numbers are given and rearrange the equations so that you are solving for the unknown.

EmilyJoo_1G
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

### Re: Equations and their purpose

The E=hv equation is used to find the energy of a photon. The variables in the C=(lambda)(v) equation are usually rearranged to find wavelength or frequency. The Rydberg formula is used to find the wavelength of the light emitted by electrons jumping between different energy levels.

Katherine Brenner 3H
Posts: 73
Joined: Wed Sep 18, 2019 12:18 am

### Re: Equations and their purpose

Same Haley!

Thank you so much to everyone who responded because now it makes sense.