Discussion Overview
The discussion revolves around the time taken for particles, specifically photons and neutrons, to change momentum when interacting with surfaces, including bouncing and absorption processes. It also touches on the concept of particles, such as neutrinos, being at rest in reality versus theory. The scope includes theoretical considerations, conceptual clarifications, and exploratory reasoning regarding particle interactions.
Discussion Character
- Exploratory
- Conceptual clarification
- Debate/contested
Main Points Raised
- One participant questions the time it takes for particles to change momentum when bouncing off or being absorbed by a surface, specifically comparing photons and particles with rest mass.
- Another participant asserts that photons do not bounce but are absorbed and then re-emitted by atoms, suggesting a different interaction mechanism compared to particles with mass.
- A participant states that neutrons can be at rest in reality, challenging the notion that they can only be at rest in theory.
- There is a query about whether neutrinos can be at rest in reality, with a response indicating that if neutrinos have mass, it is theoretically possible, although none have been trapped yet.
- Participants discuss the timescale for photons reflecting off mirrors and electrons interacting with solid surfaces, with one suggesting that the timescale for photons is comparable to the lifetime of excited atomic states.
- Another participant mentions that the reflection of electrons can be treated classically and depends on the properties of the reflecting medium.
Areas of Agreement / Disagreement
Participants express differing views on the nature of photon interactions, with some asserting that photons do not bounce while others explore the concept of reflection. There is also a lack of consensus on the specifics of how long these interactions take, indicating ongoing debate and uncertainty.
Contextual Notes
Participants reference the lifetime of excited atomic states and the properties of reflecting media, but these concepts remain loosely defined and not fully resolved within the discussion.