All Questions
14
questions
1
vote
2
answers
110
views
How do scientists focus high energy electromagnetic waves onto a target?
For visible light, we are able to use mirrors to focus on what we want.
However, gamma rays' wavelengths are too short and can't see solid objects.
So how do scientists focus high-energy ...
- 625
0
votes
1
answer
81
views
What is a reference for a practical experiment for existence electric field wave and magnetic field wave in an electromagnetic wave?
Maxwell equations lead to simultaneous perpendicular oscillations of electric field as well as magnetic field with same amplitude and “wavelength”. But, they do not guarantee any propagation of these ...
1
vote
3
answers
75
views
Can a detector fail to detect a wave of electromagnetic radiation because the wave's amplitude is at or near its minimum?
If a very brief wave (perhaps a single photon, or maybe a soliton?) is at its minimum (a 'node') when it encounters a detector, would it still be detected?
- 4,509
1
vote
1
answer
99
views
Experiment for jammers
I'm going to grade 11 and I have to write an essay in physics. One requirement is to do an experiment which - in the best case - also includes measurements.
I would like to write about jammers, which ...
5
votes
2
answers
1k
views
Are there experimental observations of the Abraham-Lorentz force?
The Abraham-Lorentz force is the force a classical charged particle particle exerts on itself due to its own electromagnetic field. It has a rather simple formula that reads
$$
\vec{F}_\mathrm{AL} = \...
- 20.4k
5
votes
3
answers
859
views
Common microwave absorbing substances
I'm looking to demonstrate to class of students how microwave absorption works, but I need something relatively common which I can easily make into a board. Does anyone have any suggestions for ...
- 972
3
votes
1
answer
69
views
Can changes in a magnetic field travel easily over large distances? [closed]
Here's what I did: I directed a laser onto a mirror that is hanging by a thread. The mirror is attached to the thread by two small magnets. The reflected beam of the laser is directed to a target. I ...
- 4,711
0
votes
1
answer
105
views
How do you prevent electromagnetic radiation emitting from a new house? [closed]
Does anyone know how to prevent electromagnetic radiation emitting from a new house? We live very near a radio telescope and we're told that electromagnetic radiation from domestic houses causes ...
2
votes
1
answer
383
views
Why are only some portions of the EM spectrum able to pass through a metal dog bowl?
In this photo you can see part of the bowl, which I turned upside down and placed on top of various electromagnetic sources to determine whether the waves could pass through it. The graph in the ...
- 4,711
1
vote
1
answer
46
views
How to Vary the wavelength of UV CFL? [closed]
I have a $12$ $V$ $DC$ operated UV $[CFL]$(http://en.wikipedia.org/wiki/Compact_fluorescent_lamp) with $365$ $nm$ wavelength. I need to vary this wavelength in the $250-300-350-400-450-500$ $nm$. ...
- 11
2
votes
1
answer
657
views
Waveguides Transmission Mode Determination
How do I know if I have TE, TM, or TEM rectangular conductive waveguide? For instance, I am doing a lab where we want maximum magnetic field in the waveguide, does that mean we want the TE because $\...
- 980
3
votes
2
answers
3k
views
Electromagnetic Momentum
My book says : The fact that electromagnetic radiation of energy carried momentum was known from classical theory and from the experiments of Nichols and Hull in 1903. This relation is also consistent ...
user24082
3
votes
4
answers
5k
views
Magnetic fields and gravitational waves. How far do they reach?
I read that magnetic fields perpendicular to a current shoot out and expand all the way to infinity.
Additionally a gravitational wave, no matter how small will also expand to infinity at the velocity ...
- 345
18
votes
5
answers
4k
views
Home experiments using wireless LAN or mobile phones about electromagnetism?
Are there any nice experiments using wireless LAN access points or routers or mobile phones to demonstrate physical features of electromagnetic fields, especially em-waves?
More precisely I am ...