Tagged Questions
-1
votes
0answers
29 views
Echo of a sound whose source is moving away from the wall [closed]
A girl walks. She is $50m$ in front of the wall and she begins to sing. Find when she will hear the sound echo if she recedes from the wall at $2m/s$. The temperature is $12^0 C$.
I don't know where ...
0
votes
0answers
115 views
Sum of intensity of reflected and transmitted waves
The given state:
Let $\psi$ be a wave that passes from medium $a$ to medium $b$.
Let $A$ be the amplitude of $\psi$.
Let $R$ be the amplitude ratio of the reflected wave $\psi_r$ and the original one, ...
5
votes
1answer
112 views
How is it possible for an Ultrasound device to correctly interpret a negative density change in tissue?
I understand the principles of Ultrasound Imaging, and the mathematics behind sonar velocity, impedance, and reflection.
I also understand that an Ultrasound device recieves an echo produced by ...
0
votes
1answer
99 views
Refraction and Reflection Seismology
So I am wondering if I got the difference right. Both methods use explosives to send waves into the earth's surface. Now reflection seismology tries to get information from the reflected waves; the ...
-3
votes
1answer
151 views
how to simulate wave interference [closed]
I need to simulate wave interference with reflection from surfaces.
What formulas I need to use?
What differential equation I need to solve? - Could someone help me out?
0
votes
0answers
42 views
EM-wave hits a brick-wall, $\pi/2$ -phase-shift? [duplicate]
Possible Duplicate:
Phase shift of 180 degrees on reflection from optically denser medium
If I have a cord-wave, I get a phase-shift with attached cord but do I get such a phase-shift with ...
3
votes
2answers
637 views
How do mirrors work?
Apparently, light is just a certain wavelength, or "the visible spectrum" of electromagnetic waves. If I recall correctly, my physics teacher explained to me that electromagnetic waves are basically ...
7
votes
3answers
3k views
Phase shift of 180 degrees on reflection from optically denser medium
Can anyone please provide an intuitive explanation of why phase shift of 180 degrees occurs in the Electric Field of a EM wave,when reflected from an optically denser medium?
I tried searching for it ...
5
votes
2answers
2k views
Reflection of transverse and longitudinal waves
Why is it that when a transverse wave is reflected from a 'rigid' surface, it undergoes a phase change of $\pi$ radians, whereas when a longitudinal wave is reflected from a rigid surface, it does not ...
1
vote
0answers
123 views
How to derive a multi-reflection echo from a given single-reflection “trace”
Consider a one-dimensional semi-bounded "ray" (or thin "cylinder") of stratum (or just any homogeneous substance) which has several "features" along it's length (say, thin films). Consider a wave that ...
2
votes
3answers
459 views
Electromagnetic wave reflection vs. light reflection
Related: x-ray interaction with atmosphere
I know that electromagnetic waves of particular frequencies reflect from the ionosphere. And the light (which from one perspective is an electromagnetic ...
