All Questions
Tagged with reflection waves
182
questions
5
votes
2
answers
231
views
Huygens' principle and the laws of reflection/refraction
As I understand the Huygens principle, all points on the wavefront are sources of secondary spherical wavelets and the tangent to these wavelets will form new wavefront. This is used to prove the ...
- 307
0
votes
1
answer
39
views
Pointing flash at LCD television creates a weird diffraction effect
I was looking around my room for something with my phone’s flash on, and noticed a very unique pattern reflecting off of the television.
FYI. The flash is white.
Any idea why it diffracts like that?
...
- 390
0
votes
1
answer
73
views
Electromagnetic reflection without velocity change
The Fresnel equations describe the reflection and transmission of electromagnetic waves between two media. The parameter in the equations is the impedance ratio, where the impedance is $Z=\mu/\epsilon$...
- 2,141
4
votes
1
answer
73
views
Question about amplitude of wave [closed]
Is it always true that:
$$\text{Incident Amplitude} = \text{Transmitted Amplitude} - \text{Reflected Amplitude}?$$
-1
votes
1
answer
31
views
Why does reflected light not cancel out depending on color?
I have been learning about light reflection and refraction and was thinking about objects reflecting only certain wave-lengths.
Why doesn't a red object with a green light shone on it appear black?
I ...
0
votes
1
answer
82
views
Equation of a reflected wave at a fixed end
If $y1=Asin(kx-wt)$, it is identical with $y2=-Asin(wt-kx)$.
But then if I write a reflected equation of y1, it is -Asin(kx+wt), whereas the reflected equation for y2 becomes Asin(wt+kx) since both ...
- 1
1
vote
0
answers
25
views
Two-Ray Ground-Reflection Model: Understanding the Difference in Phase Offsets at the Receiver
Currently, I'm trying to understand the Two-Ray Ground-Reflection Model.
During my research, I came across the following simplification expressing the received power as follows (taken from Wikipedia):
...
- 11
1
vote
1
answer
57
views
Why are things reflective, absorbent, transparent etc? [duplicate]
What determines whether a material reflects, absorbs or transmits a certain wavelength of light? Just a layman's question.
- 111
0
votes
1
answer
81
views
Huygens' Principle and Reflection
I was hoping to ask a question about Huygens' principle, which I am using to understand diffraction and reflection. I have seen videos and websites like these that explain why Huygen's principle leads ...
- 11
1
vote
0
answers
65
views
What are the physics behinde reflection and refraction of electromagnetic wave at a dialectric surface?
I have understood the most of the equations that lead to the Fresnel-Equations from electromagnetic waves and Maxwell equations. But not enough to understand what is happening. So I don't ask for an ...
- 11
0
votes
1
answer
82
views
Wave on a string- Reflection of waves
A pulse is sent on a string which is attached to a ring at the right end, and the ring is free to move without friction on a vertical rod. When the pulse reaches the ring, the ring is displaced ...
- 128
3
votes
1
answer
90
views
Reflection versus Refraction with Waves
I am a middle school science teacher and we teach a unit on waves (mostly about sound) My students struggle to identify whether a wave (usually sound) is refracting or reflecting across many different ...
- 33
0
votes
1
answer
86
views
How can I mathematically describe the reflected sound waves in an open tube?
When a sinusoidal sound wave passes through a tube open at both ends, it will get reflected when it reaches the end of the tube. The reflected wave will itself reflect when it reaches the opposite end ...
3
votes
1
answer
166
views
What happens microscopically when an EM-wave encounters a conductor? - Why is there no transmission of any EM-waves?
Essentially i have the same question as stated here:
What happens when an Electromagnetic wave encounters a conductor's surface?
I want a microsopically motivated answer, i.e. what the charges ...
- 103
0
votes
1
answer
191
views
Reflection of sound wave passing through gas to solid and through solid to gas
Why following are true in both cases?.
1- Ultrasound passing through a metal block(solid medium) will not pass through a cavity (air medium) inside the block.
I got some explanation as speed of sound ...
- 101