Why light fades over distance?

  • Context: Undergrad 
  • Thread starter Thread starter smuga
  • Start date Start date
  • Tags Tags
    Light
Click For Summary
SUMMARY

Light fades over distance due to the inverse square law, which states that the intensity of light diminishes as the distance from the source increases. This phenomenon is particularly evident in astronomical observations, such as type 1a supernovae, which appear fainter when they are farther away. While the energy of each individual photon remains constant, the number of photons per unit area decreases, leading to a reduction in perceived brightness. Understanding this principle is crucial for interpreting astronomical data accurately.

PREREQUISITES
  • Understanding of the inverse square law in physics
  • Basic knowledge of photon behavior and energy
  • Familiarity with astronomical phenomena, specifically type 1a supernovae
  • Concepts of light intensity and distance measurement in space
NEXT STEPS
  • Research the inverse square law and its applications in physics
  • Study the characteristics and significance of type 1a supernovae in cosmology
  • Explore the behavior of photons and their energy in different mediums
  • Investigate methods for measuring astronomical distances and their impact on light perception
USEFUL FOR

Astronomers, physics students, educators, and anyone interested in the principles of light propagation and astronomical observations.

smuga
Messages
1
Reaction score
0
According to our observation light fades over distance.
Please explain to me why light fades over distance in space (type 1a supernovas are observed fainter when they occur farther). Why is that since every individual photon’s energy is constant through its movement through space? Am I right?
 
Science news on Phys.org
While each individual photon's energy is constant, the number of photons per unit area diminish with distance according to an inverse square law. See: http://hyperphysics.phy-astr.gsu.edu/HBASE/vision/isql.html"
 
Last edited by a moderator:

Similar threads

Undergrad An Imagined Diffraction Grating
  • · Replies 7 ·
Replies
7
Views
1K
Undergrad Light coupling in fiber optic cables
  • · Replies 22 ·
Replies
22
Views
4K
Undergrad Focusing light with a light sail
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Interferometer delay & line light spreading
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Switching polarizer and analyzer: the order matters -- why?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Visible light Over Large Distances
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Is there a limit to the amount of info in reflected light?
  • · Replies 63 ·
3
Replies
63
Views
6K
Undergrad How do you get to the conclusion that there is accelerating expansion?
  • · Replies 23 ·
Replies
23
Views
4K
Graduate Why does the speed of light change in different media?
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad The Einstein Clock aka Light Clock
  • · Replies 34 ·
2
Replies
34
Views
4K