Is There a Speed of Darkness? And Other Questions About Light and Perception

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Discussion Overview

The discussion revolves around the concept of "speed of darkness" and its relation to light. Participants explore whether darkness can be considered to have a speed, how it relates to the absence of light, and the implications of shadows moving across surfaces. The conversation includes theoretical considerations, humorous remarks, and personal experiences related to darkness and light perception.

Discussion Character

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

Main Points Raised

  • Some participants suggest that darkness is simply the absence of light and therefore does not have a speed of its own.
  • Others propose that the speed at which darkness "travels" can be equated to the speed at which light leaves a region, leading to varying interpretations of its speed.
  • A few participants discuss the movement of shadows, suggesting that shadows can appear to move faster than light under certain conditions, though this is contested.
  • Some argue that darkness is a physiological state rather than a physical one, questioning the validity of discussing its speed.
  • Humorous remarks about darkness and silence are made, indicating a light-hearted approach to the topic.
  • One participant mentions that darkness can be experienced in total absence of light, such as in a cave, challenging the notion that darkness is merely a conceptual term.
  • There are discussions about the relationship between the distance of a shadow and its perceived speed, with some suggesting a bell-shaped relationship.
  • Participants express differing views on whether darkness can be defined or measured, with some asserting it is a human concept while others see it as a physical phenomenon.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether darkness has a speed or how it should be defined. Multiple competing views remain, with some arguing for a physical interpretation and others for a more conceptual understanding.

Contextual Notes

Limitations include the ambiguity in defining darkness and its relationship to light, as well as the varying interpretations of speed in relation to shadows and darkness. The discussion also highlights the subjective nature of experiencing darkness.

  • #31
explorer2909 said:
I think I am supposed to give the link of the document I quote, here is the link, crackpot link deleted
I have two more questions after reading the article, 'How do we perceive light?' 'Why we cannot see the sun or any other light source even when our eyes can absorb the photons emitted by the sun?'

and, as shown in one of the experiment in the article, 'how can image in the mirror be formed even when path of the light between the mirror and the object is blocked?'

Since you have taken time to read, I assume in detail, a worst case web source you really should give equal time to a real physics text.

thread locked.
 

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