Zero.Bruce Haawkins said:given a complete vacume.
given a volume.
given a temprature.
given a wavelenth.
work out the number of photons in the vacume?
Mentz114 said:Zero.
The vacuum is empty by definition. There must be an electromagnetic field in order for photons to exist and that is not a complete vacuum.
You have been mislead if you think otherwise.
Mentz114 said:Zero.
The vacuum is empty by definition. There must be an electromagnetic field in order for photons to exist and that is not a complete vacuum.
You have been mislead if you think otherwise.
Mentz114 said:For coherent states if the average photon occupancy number ( for a mode ##k##) is ##\bar{N}## then the probability of detecting ##n## photons with mode ##k## is given by the Poisson distribution with mean ##\bar{N}##.
stevendaryl said:Well, I think that the question can be interpreted in terms of black-body radiation. Imagine a closed impenetrable box of some sort where the walls are kept at a constant temperature ##T##. The box is evacuated of air. The question is whether the space inside will fill with low-frequency photons. Or classically, will there be a nonzero energy density for electromagnetic energy inside the box?
jtbell said:
The number of photons in a vacuum can be calculated using the formula N = V * ρ, where N is the number of photons, V is the volume of the vacuum, and ρ is the energy density of the vacuum.
The energy density of a vacuum is the amount of energy per unit volume that exists in a vacuum. It is typically measured in units of joules per cubic meter (J/m3).
No, the number of photons in a vacuum cannot be directly measured. However, it can be calculated using the formula N = V * ρ.
The number of photons in a vacuum is directly proportional to the intensity of light. This means that as the number of photons increases, the brightness or intensity of light also increases. Additionally, the color of light is determined by the number of photons within a certain range of wavelengths.
No, the number of photons in a vacuum can vary depending on factors such as the energy density of the vacuum or the size of the vacuum. However, the total energy of the vacuum remains constant, as stated by the law of conservation of energy.