## When to use Planck's Constant [ENDORSED]

Matia Kim 1B
Posts: 60
Joined: Fri Apr 06, 2018 11:03 am

### When to use Planck's Constant

I know that Planck's Constant is 6.626 x 10^-34 J S but what's the significance of it and when do you use it?

Betty Wolkeba section 1L
Posts: 32
Joined: Fri Apr 06, 2018 11:05 am

### Re: When to use Planck's Constant

Plank's constant is the amount of energy a photon carries with the frequency of its electromagnetic wave. We use it whenever we solve for the energy per photon (E= frequency x plank's constant)

Danielle Sumilang - 1F
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

### Re: When to use Planck's Constant

You use Planck's Constant(h) when finding the energy of a photon (E=hv). Based off of this equation, we know that Energy and frequency are directly proportional. If I'm not mistaken, I remember Dr. Lavelle mentioned in the Photoelectric module video that when you graph the energy of the photon against the frequency, the proportionality constant is Planck's constant. Similar to how m represents the slope in the formula y=mx, h represents the slope of the formula E=hv.

Aryana Nazem 1A
Posts: 40
Joined: Fri Apr 06, 2018 11:04 am

### Re: When to use Planck's Constant

For question 9 chapter one, when we are given a frequency of 300 MHz and we want to find the energy per photon I presume we just plug it into the E=hv formula but when i do this I get 2 x 10 ^-37 which is not the write answer for E.

Nimrat Brar 1E
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am
Been upvoted: 1 time

### Re: When to use Planck's Constant

When calculating a photon's energy from its wavelength, you would use planck's constant. It is significant because it links the amount of energy a photon carries with the frequency of its electromagnetic wave.

Myles Chang 1B
Posts: 29
Joined: Fri Apr 06, 2018 11:02 am

### Re: When to use Planck's Constant  [ENDORSED]

Use Planck's constant whenever you see the letter "h" in an equation you need to use on the sheet provided on top of the test.