All Questions
16
questions
1
vote
1
answer
71
views
Why is Wien's displacement law not discrete? [duplicate]
We are taught that the electrons emit electromagnetic waves/photons when transitioning from one quantum level to another in a discrete manner. This is what causes the spectral line of specific ...
- 43
0
votes
1
answer
55
views
Does the quantisation of energy apply to everything? [duplicate]
Radiation is quantised according to Planck, so that's out of the question. However, I have seen many simplifications that claim Planck introduced quantised energy. Period. Has Planck really done that? ...
- 359
2
votes
1
answer
178
views
Time delay between consecutive photon absorptions by atoms/molecules?
We are just getting introduced to some basics of quantum physics at school and in my nationally prescribed school book, its written that:
Planck assumed that radiation could be subdivided into ...
- 1,168
-4
votes
3
answers
205
views
Planck's quantum theory
Recently came across Planck's theory, $E = h\nu$.
It means that at any frequency, there is given energy. But I also saw that, $E$ can be $0, h\nu, 2h\nu, 3h\nu,...$.
How is it possible that energy can ...
- 31
3
votes
3
answers
378
views
If frequency is continuous shouldn’t energy be non-quantised?
If $E=hf$ and the frequency of electromagnetic waves is continuous (i.e. you can have frequencies of $1.5\ Hz$ or $0.3\ Hz$ for example) then surely energy isn’t discrete or quantized into because one ...
- 33
3
votes
1
answer
112
views
Interplay of energy between photon, electronic energy levels and kinetic energy
I can understand that atoms have quantized energy levels for its electrons, but an atom's translational kinetic energy is continuous. As such, why is the absoprtion spectrum not continuous? That is to ...
- 840
5
votes
5
answers
2k
views
Why the energy of electromagnetic waves is directly proportional to frequency whilst for mechanical waves this is not true?
The energy of a photon is directly proportional to its (angular) frequency:
$$
E=\hbar \omega.
$$
The energy of a classical mechanical wave is, however, proportional to the square of $\omega$:
$$
E=\...
- 1,335
2
votes
0
answers
182
views
Is every kind of energy quantised? [duplicate]
I know this is been asked on this site before but I felt unsatisfied by its one answer.
I’m familiar with the concept of quantisation, I keep reading that “energy is quantised” but what do they mean ...
- 49
1
vote
0
answers
50
views
Why is energy proportional to light's frequency? [duplicate]
I can appreciate that light can be quantised into photons, but I'm having a bit of difficulty understanding Planck's formula $$E=hf$$
Perhaps I am lacking intuition, but I don't really see why higher ...
- 2,356
1
vote
2
answers
613
views
Relation between frequency and energy of a photon [closed]
Why does the energy of a photon increase when the frequency increases?
Is it the energy of the photon that defines its frequency or is it the frequency that defines its energy?
-1
votes
1
answer
151
views
Does the continous EM spectrum contradict discrete energy? [duplicate]
After some research, it seems apparent to me that the EM spectrum is continuous, but this would contradict a physics fundamental that energy is discrete. Is there a conflict here?
- 4,711
2
votes
1
answer
464
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Is it possible to synthesize an EMW which is not quantized?
( I initially started to ask, "since according to Quantum-theory of light; the energy of a photon, depends only on the frequency of light-wave (E = h * nu), and no-mention of amplitude. So, does the ...
user115953
1
vote
1
answer
3k
views
Power and frequency of photons and its relationship with biological safety
I understand that x-rays are more dangerous than radio waves because they are of higher energy, since they have higher frequency. However, it’s less dangerous to stand near a radio station with a ...
- 1,499
2
votes
3
answers
4k
views
Do ionisation of atoms release photons?
I was reading through my text book about Fluorescence. It said "inside a fluorescent bulb, the mecury atoms collide with each other and with electrons get excited and ionised. During de-excitation, ...
- 1,107
1
vote
3
answers
1k
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What is the energy of a standing EM wave? Is it probabilistic?
In a cavity, the standing wave will constructively interfere with itself, so its energy gets higher while the oscillator is still vibrating. Since the vibration time is not a constant value, and ...
- 1,168