All Questions
30
questions
10
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1k
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What fraction of the universe's energy is contained in photons?
From each point in the universe, the light of billions of stars, galaxies, supernovae etc. can be detected. So there seems to be a lot of energy/momentum "in flight".
Is it possible to ...
- 347
1
vote
2
answers
354
views
Are gamma rays the limit of the frequency photons can attain, and if yes, why? [duplicate]
Recalling that the Planck constant is $6.62607015 \times 10^{-34} m^2kg/s$ and taking into account the formula $E=hf$, for the energy of photons, we can rapidly derive the energy of gamma rays, which ...
- 143
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
3
votes
0
answers
31
views
How nucleons get excited? [duplicate]
Gamma rays can be released when nucleons at higher energy states fall down to lower energy states, but how do nucleons get that much high energy to release gamma rays?
- 31
1
vote
0
answers
66
views
Upper limit of energy carried by one photon [duplicate]
energy carried by one photon, $E = hυ$ where $υ$ is frequency and $h =$ planck constant. Is there any upper limit to how much energy one photon can carry? or any upper limit of frequency?
- 67
-1
votes
2
answers
66
views
The energy of the photon $hf$, so what is the energy of other masses such as the Earth?
The energy of the photon $hf$, so what is the energy of other masses, and of course I do not mean to write in frequency $f$, what is the relationship of the energy of other masses
- 95
1
vote
3
answers
512
views
Comparing a 100W and a 40W light bulb that only emits a specfic frequency
I'm sort of confused by this... let's just say the bulbs only emits green light, and we compare a 40 W and 100 W bulb (identical except one is brighter than the other), since the frequency of light ...
0
votes
0
answers
34
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What is the highest possible energy of a photon? [duplicate]
Are following suggestions ok to cap the energy of a photon?
When the photons have enough energy in a small enough volume to collapse into a black hole
When the wavelength of the photons becomes the ...
- 369
0
votes
0
answers
40
views
Why is photon quantized in vacuum? [duplicate]
Apparition of quantized energy levels in quantum physics is usually explained in analogy with sound waves in a box (like in music instruments): the wave has to satisfy the boundary conditions and ...
- 149
-1
votes
1
answer
130
views
What is the energy of one photon radiation? (Probably super basic for you)
So, this is given question:
The radio station emits radiation power of 6 kW, wavelength 3 m.
a) What is the energy of one photon radiation?
b) How many photons are emitted in 5s?
I tried ...
- 103
2
votes
2
answers
401
views
Hypothetical maximum energy of a single photon [duplicate]
I'm no physicist so it might be a stupid question but is there a maximum energy a single photon can have?
My idea was, that there might be restriction for the minimum wavelength and I thought about ...
- 121
0
votes
1
answer
119
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Question about quanta and $E=h\nu$
It is my understanding that Planck's major breakthrough was that energy comes in the forms of 'packets' called quanta, each of which has the energy of $6.62e-34$ of one Joule.
By looking at Planck's ...
- 136
1
vote
1
answer
65
views
Energy-frequency dependency of a photon and its medium of propagation
Is the equation relating a photon's energy to its frequency the same regardless of its medium of propagation? And for the equation relating its momentum to wavelength as well?
- 11
4
votes
4
answers
439
views
In $E=hf$, can $f$ assume any positive value? (Beginner) [duplicate]
The energy of photon is given by the equation $E=hf$, where $h=$ Planck's constant, and f=frequency of radiation. Is f quantized, or can it assume any value?
If it can assume any value, then wouldn'...
- 115
1
vote
1
answer
79
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Wave energy in terms of classical and quantum mechanics [duplicate]
If there are two light waves of same amplitude but of different frequencies then their energy will be same or different? If same then how will you define the light waves as photons and will there be a ...
- 11