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Dose E=hn means quantization of energy?

by athrun200
Tags: dose, energy, means, quantization
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athrun200
#1
Feb11-12, 05:31 AM
P: 277
I have an example class yesterday, but one question troubled me.

In part (b), why does E=nhf?
For me, it seems E=nh is enough, why does the equation involve frequency f after quantization?
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gomunkul51
#2
Feb11-12, 07:44 AM
P: 275
One answer might be: The unit of E (energy) is a Joule, the unit of h (Plank's constant) is Joule time a second. If you want the equation to be correct you need to multiply h with something that has units of 1 over a second.


Roman.
bcbwilla
#3
Feb11-12, 05:42 PM
P: 103
Quote Quote by athrun200 View Post
In part (b), why does E=nhf?
For me, it seems E=nh is enough, why does the equation involve frequency f after quantization?
What do you mean "E = nh is enough"? That equation is not correct, because as pointed out above, the units are not correct.

derek101
#4
Feb11-12, 06:36 PM
P: 22
Dose E=hn means quantization of energy?

h = energy per cycle.
f = number of cycles per unit of time.
your quantization must include a quantization of time.
athrun200
#5
Feb11-12, 07:33 PM
P: 277
Thanks! I have forgotten to consider the unit.
questionpost
#6
Feb12-12, 09:02 PM
P: 198
Energy within a single system is quantized, but there are different energies that result from following the E=nh model in different systems, so if you consider every possible system energy is continuous, just like the light spectrum.


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