As you move away from a lightsource

  • Thread starter Thread starter grantP
  • Start date Start date
AI Thread Summary
As you move away from a light source, the wavelength of the light remains constant, but the observer may perceive a red shift due to the Doppler effect. This phenomenon occurs because light sources moving away from the observer appear to have longer wavelengths, while those moving towards them exhibit shorter wavelengths, or blue shift. Although the speed of light is constant, the frequency perceived by the observer decreases as the source moves away. The discussion clarifies that the physical properties of light do not change, but the perception of those properties can vary based on relative motion. Understanding these concepts is crucial in fields like astronomy and physics.
grantP
Messages
19
Reaction score
0
As you move away from a lightsource...

Homework Statement


(from title)
...the wavelength of the light _______? (increase, stays the same, decrease, decrease in amplitude?)

Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
my guess would be the wavelength would stay the same, but I am not certain at all, anyone know?
 
explain why you believe it would stay the same.
 
well because wavelength is the distance between two successive points on waves right? well as you move away, the length dosent change, just the amount or possibly the frequency?
 
This is just a theory. Technically neither the frequency or wavelength change. But for the observer, if you account for the Doppler effect, light sources/stars moving away from the Earth appear to have a 'red shift' while those moving towards Earth have a 'blue shift'. Red light has a longer wavelength than blue light. Frequency appears to decrease, but speed of light remains the same.
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Diffraction pattern from a grating
Replies
3
Views
847
Why does electric potential energy increase if you move against the field?
Replies
6
Views
1K
Range of frequency heard by observer related to Doppler effect
Replies
8
Views
1K
Damped harmonic motion
Replies
3
Views
663
Moving charge deflected by a loop of wire
Replies
1
Views
714
Pulse Duration (PD), Pulse Repetition Period (PRP) and Duty Factor (DF)
Replies
1
Views
3K
Change in electric potential energy
Replies
3
Views
2K
Water waves travelling from deep to shallow water
Replies
4
Views
2K
Direction of current as bar magnet moves uniformly through copper ring
Replies
3
Views
1K
Single Slit Interference Pattern: Increased Distance
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top