Is the number of cycles in a wave related to the uncertainty in the wavelength?

In summary, the number of "bumps" in a wave train does not determine the number of photons present. The amplitude of the wave, or the strength of the electromagnetic field, controls the flux of photons. The number of cycles in a wave is related to the uncertainty in its wavelength, but this does not necessarily correspond to the number of photons present. A wave with a definite wavelength is infinitely long and contains an infinite number of cycles, but in reality, there is always some uncertainty in the wavelength. This means that a wave with 5 cycles could still represent just one photon, and the photon could be found at any point along the wave with equal probability.
  • #1
Infrasound
70
0
Question,

For a given wavelength of light, I have assumed that there will typically exist one photon (on average) per complete wave/peak(This would mean that a train of 5 waves would contain 5 photons). I have also assumed that the photon would most likely be "found" at the peak of the wave as it passes.

Are these fairly accurate assumptions?

-Curious Novice.
 
Physics news on Phys.org
  • #2
no, not at all.
 
  • #3
To expand on that, the number of "bumps" in the wave train does not control the flux of photons, that is controlled by the amplitude of the wave (the strength of the electromagnetic field, in the classical treatment, or the magnitude of the wave function, quantum mechanically). The number of cycles in the wave tells you something else-- it tells you the ratio of the wavelength of the wave to the uncertainty in the wavelength. A wave with a definite wavelength has to be infinitely long, and contain an infinite number of cycles, but since that's not really possible, instead we always have some uncertainty in the wavelength. A wave with 5 cycles has an uncertainty in wavelength that is 1/5 of the distance between crests-- but it could still represent just a single photon, and that photon could be manifested anywhere along that wave, with equal probability.
 

Related to Is the number of cycles in a wave related to the uncertainty in the wavelength?

1. What is the difference between a photon and a wave?

A photon is a small packet of electromagnetic energy, while a wave is a form of energy that travels through space. Photons can behave like waves, but they also have particle-like properties.

2. How do photons and waves interact with matter?

When photons encounter matter, they can be absorbed, reflected, or transmitted. Waves can also interact with matter through refraction, diffraction, and interference.

3. Are photons and waves the same thing?

No, photons and waves are not the same thing. While photons can behave like waves, they also have particle-like properties. Waves, on the other hand, do not have particle-like properties and are a form of energy that travels through space.

4. Can photons and waves travel through a vacuum?

Yes, both photons and waves can travel through a vacuum. In fact, this is the only way that photons can travel, as they are massless particles. Waves, such as electromagnetic waves, can also travel through a vacuum.

5. How are the properties of photons and waves related?

The properties of photons and waves are related through the electromagnetic spectrum. Photons are a type of electromagnetic radiation, and waves are a form of energy that travels through electromagnetic fields. This means that they share similar properties, such as frequency and wavelength.

Similar threads

Replies
14
Views
1K
Replies
80
Views
4K
  • Quantum Physics
Replies
1
Views
1K
Replies
46
Views
2K
  • Quantum Physics
Replies
2
Views
1K
Replies
18
Views
4K
  • Quantum Physics
Replies
34
Views
4K
Back
Top