Light OR Sound? - Unraveling the Mystery

  • Context: Undergrad 
  • Thread starter Thread starter Blade_Runner
  • Start date Start date
  • Tags Tags
    Light Mystery Sound
Click For Summary

Discussion Overview

The discussion revolves around the phenomena of sound and light production, specifically exploring why clapping produces sound waves rather than light waves, and the conditions under which light is emitted during electron transitions. Participants also question the role of intuition in predicting whether sound or light will be produced in various scenarios.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions why clapping produces sound waves instead of light waves, and why lighting a torch does not produce sound waves.
  • Another participant explains that sound is produced by the vibration of molecules in a medium, while light is emitted from energy state transitions of electrons, indicating a distinction between macroscopic and quantum mechanical properties.
  • A different participant asserts that lighting a torch does produce sound, suggesting that sound and light production are separate processes that can occur simultaneously.
  • Concerns are raised about the variability of intuition regarding sound and light production, noting that individual differences in perception may affect how one anticipates these phenomena.
  • One participant suggests that understanding the physical processes behind sound and light production can help inform predictions in various scenarios, such as slapping an oar on water or observing thunderstorm effects.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between sound and light production, with some asserting that they are separate processes while others suggest they can occur together. The discussion remains unresolved regarding the role of intuition in predicting outcomes.

Contextual Notes

Participants highlight the complexity of sound and light production, indicating that intuition may not be reliable due to individual differences in perception and understanding of the underlying physical processes.

Blade_Runner
Messages
8
Reaction score
0
Light OR Sound!

When we clap, we hear a sound..The reason is that on clapping sound waves are produced...
My question here is why?
Why Does Clapping produce a sound wave and not a light wave...Or when we light a torch, why are sound waves not produced...
Also, When a electron jumps from conduction band to the valence band, light is produced...What is the reason for this...
How do we decide by our intution whether light or sound would be produced...
 
Science news on Phys.org


Sound is produced by the vibration of the molecules of a medium, such as air. So clapping your hands creates a pressure wave which propagates and we experience this in sound. As you appear to know, photons are emitted from energy state transitions. The jumping electron, in the case you mentioned, releases a photon because it moves from a higher to a lower energy state, and the conservation of energy states that the extra energy must go somewhere, so it is released in the form of a photon.

In sum, light is a quantum mechanical property while sound is macroscopic.
 


Lighting a torch most certainly does produce sound. They are entirely separate processes which are not mutually exclusive.
 


How do we decide by our intution whether light or sound would be produced...

We don't rely soley on intuition because your "intuition" and mine are likely quite different. Also your visual acuity and hearing might be quite different and could affect your perception of what's going on. Actual production sound vs light of course is a different matter.

But by having a basic idea of the physical processes involved in the production of each, described above, you can make some informed guesses about, for example, slapping an oar on water; bubbles emerging in boiling water, radium decay, observing effects of a thunderstorm.
 

Similar threads

  • · Replies 29 ·
Replies
29
Views
3K
  • · Replies 16 ·
Replies
16
Views
3K
  • · Replies 40 ·
2
Replies
40
Views
5K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 2 ·
Replies
2
Views
11K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 4 ·
Replies
4
Views
10K