# Dose E=hn means quantization of energy?

by athrun200
Tags: dose, energy, means, quantization
 P: 273 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? Attached Thumbnails
 P: 276 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.
P: 103
 Quote by athrun200 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.

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.
 P: 273 Thanks! I have forgotten to consider the unit.
 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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