All Questions
42
questions
1
vote
3
answers
171
views
How to Measure Energy of a Electromagnetic Wave accounting also for frequency?
We know a way of measuring energy of a electromagnetic wave is the Poynting vector, which is independent of the frequency. But let's say we want to make two different electromagnetic waves, with ...
1
vote
2
answers
64
views
Under what conditions do waves stay monochromatic?
Based on my intuition, once light is monochromatic it will stay that way unless you actively try to change its frequency. My intuition stems from the intricate optical laser setups in my lab that ...
2
votes
1
answer
220
views
How do we know the wavelength and frequency of electromagnetic wave? [closed]
From my understanding, the frequency and wavelength of a mechanical wave can be observed by the motion of the particles (i.e., as the particles oscillate from their state of equilibrium, the wave ...
-2
votes
1
answer
260
views
What is the wavelength of red light in vacuum?
According to Wikipedia,
It has a dominant wavelength of approximately 625–740 nanometres.
However, I'm not sure in which medium this wavelength was measured. Was this wavelength measured in a vacuum?...
- 1,018
0
votes
4
answers
156
views
Difference between wavelengths relation to frequency and period relation to frequency
I know that:
$\frac{1}{T} = f$
For some oscillation or sinusoidal wave. For instance, a period of 2 has a frequency of 1/2
And, in the physics I have taken the formula would be like the one given ...
- 1
0
votes
1
answer
82
views
What's the mechanism of addition of different frequencies of light?
I suddenly thought of a interesting thing:
say there are two light rays with the exactly the same colour, for example, purple. Red light ray and blue light ray add up to purple. Also, there is a ...
- 421
6
votes
6
answers
2k
views
What ties high frequency electromagnetic waves to short wavelength and converse?
Why is it not possible to have waves with high frequency (high energy) and great wavelength and converse?
What physical quantity ties frequency to wavelength in an inversely proportional way?
- 71
0
votes
1
answer
80
views
Is light a single wave when we refer to frequency?
When we say that light oscillates $n$ times (frequency) in a second do we mean that the same electromagnetic field travelling through space oscillates $n$ time's? As i have seen diagrams suggesting ...
1
vote
1
answer
1k
views
Faraday Cage - Wavelength and hole size
I read about the faraday cages and understood that the size of the holes should be very small than the wavelength of the signal for effective shielding.
But I am really confused due to the ...
- 109
1
vote
2
answers
808
views
Speed of electromagnetic wave in a medium
Speed of electromagnetic wave in a medium (for example air) is different for different frequency (for exmaple red light is faster in air than blue light).
So how can we calculate the speed of light ...
- 451
0
votes
4
answers
380
views
What is the physical meaning of frequency in the wave concept?
Treating light as a wave, we define its frequency. We see that light with different frequency have different colour. But, why? In wave, what property or physical meaning does frequency provide?
- 662
0
votes
0
answers
359
views
What is the physical meaning when we say complex waveform has an energy at certain frequency?
We say that a complex periodic wave has an energy at certain frequencies.
Or we can also say that such waveform has a certain “frequency component”.
I understand that mathematically it means we can ...
- 21
2
votes
3
answers
305
views
How is the frequency of a wave defined if it propagates on three different directions?
Let's consider a wave which propagates on 2 or three directions, like for instance an electromagnetic wave inside a rectangular waveguide totally closed on two ideal conductor surfaces:
The walls of ...
- 1,319
-1
votes
1
answer
1k
views
Long Range - High Frequency or Low Frequency [closed]
I have a confusion regarding which signal covers more distance - high frequency signal or low frequency signal?
My understanding - high frequency signal has high energy. So, it has the energy to ...
- 109
2
votes
1
answer
716
views
In electromagnetic waves, what exactly do changes in frequency and amplitude do?
I recently learned about how lower frequency electromagnetic radiation is less harmful compared to photons above the ultraviolet type C frequency which have ionizing radiation because they contain ...
- 444