## Planack's constant

Savannah Mance 4G
Posts: 107
Joined: Fri Aug 30, 2019 12:17 am

### Planack's constant

Dr. Lavelle mentioned Planack's constant is h=6.63x10^-34 J.s in lecture. What is Planack's constant used for or what is it a constant for?

Akshay Chellappa 1H
Posts: 59
Joined: Wed Sep 11, 2019 12:15 am

### Re: Planack's constant

I believe that Planck's constant is used when calculating the energy of a photon. It is represented by the variable h in the equation E=hv.

Alan Wu
Posts: 61
Joined: Sat Sep 14, 2019 12:16 am

### Re: Planack's constant

Placnk's constant is used to find the energy of a photon given its frequency or wavelength.

These 2 equations are very handy:
Energy of photon = planck's constant (h) * frequency
Energy of photon = planck's constant (h) * (speed of light (c) / wavelength)

ahuang
Posts: 52
Joined: Fri Aug 30, 2019 12:17 am
Been upvoted: 1 time

### Re: Planack's constant

Planck's Constant is used in the following equations:
E=hv (Energy = h * frequency)
E = (-hR)/n^2 (Energy = (-hR)/(energy level)^2

Shimei_2F
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am
Been upvoted: 1 time

### Re: Planack's constant

it is used to find E=hv. It can be used with c=lv to calculate and find values
h is planck's constant

Leila_4G
Posts: 114
Joined: Sat Sep 14, 2019 12:17 am

### Re: Planack's constant

Where does the constant come from? How was it derived?

Junxi Feng 3B
Posts: 52
Joined: Sat Sep 14, 2019 12:17 am

### Re: Planack's constant

The Planck's constant is used in the Einstein equation E=hv, where h is the Planck's constant and v is the frequency of the light. With the constant, we can calculate the energy per photon.

sarahwu3a
Posts: 50
Joined: Sat Aug 17, 2019 12:17 am

### Re: Planack's constant

Plancks constant is essentially only used in Einstein's equation E=hv to find the energy of a photon with a given frequency.

Erik Buetow 1F
Posts: 96
Joined: Fri Aug 30, 2019 12:15 am

### Re: Planack's constant

Planack's constant can be used to help find the energy of a photon if you are using the equation E=hv, where E is energy, h is planack's constant, and v is the frequency.