All Questions
56
questions
11
votes
4
answers
2k
views
Can the laser light, in principle, take any wavelength in the EM spectrum?
Can the laser light, in principle, take any wavelength in the EM spectrum? I don't think there is what prevent this in principle, right?
- 959
-1
votes
2
answers
80
views
What's the difference between the different kinds of EM waves?
I am an A-level student.
We have traditionally been taught that different types of EM waves exist only between certain ranges of wavelengths and frequencies.
However, I learned that electromagnetic ...
15
votes
6
answers
7k
views
Why color depends on frequency and not on wavelength? [duplicate]
To explain my question lets consider this example:
The wavelength of light in a medium is $\lambda=\lambda_{0}/\mu$, where $\lambda_{0}$ is the wavelength in vacuum. A beam of red light ($\lambda_{0}=...
- 2,517
1
vote
1
answer
63
views
If the speed of light is a constant value and the wavelength is constant (antenna), how can one antenna transit/receive different frequencies?
The speed of light is about 300,000,000 m/s, and the wavelength is determined by the design of the antenna, how can one antenna transmit different frequencies other than just the one defined by
f = c /...
- 13
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 ...
1
vote
0
answers
21
views
Why does frequent remain constant in refraction? [duplicate]
So at school the told us that:
V= f x λ
In refraction we were told that direction,speed and wavelength changes when a wave crosses different mediums, and on another occasion that frequency is the ...
- 11
1
vote
1
answer
4k
views
Converting between $F_{\nu}$ and $F_{\lambda}$ spectral density
In papers, spectral energy distributions are given either in $F_\nu$, $\nu F_\nu$, $F_\lambda$ or $\lambda F_\lambda$.
$F_\nu$ has units of Janskys, for example.
Is there a clear explanation online I ...
- 181
-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
9
votes
1
answer
280
views
Is there any end to the electromagnetic spectrum? [duplicate]
Is there any theoretical end to the electromagnetic spectrum…
1
vote
2
answers
354
views
Are gamma rays the limit of the frequency photons can attain, and if yes, why? [duplicate]
Recalling that the Planck constant is $6.62607015 \times 10^{-34} m^2kg/s$ and taking into account the formula $E=hf$, for the energy of photons, we can rapidly derive the energy of gamma rays, which ...
- 143
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
-2
votes
1
answer
58
views
If frequency of light never changes, is there finite number of blue light, red light, etc.?
AFAIK light's frequency cannot change. If that is the case, would it mean that there is a finite amount of every frequency floating around in the universe? ie. some finite number of 400hz light rays, ...
- 121
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
1
vote
0
answers
66
views
Upper limit of energy carried by one photon [duplicate]
energy carried by one photon, $E = hυ$ where $υ$ is frequency and $h =$ planck constant. Is there any upper limit to how much energy one photon can carry? or any upper limit of frequency?
- 67
0
votes
1
answer
198
views
Is there a finite number of colors in the visible spectrum? [duplicate]
Does quantum theory and Planck's length of $1.6\times10^{-35}\ \mathrm{m}$ mean that the electromagnetic spectrum is not continuous as every photon can only carry a discrete amount of energy?
If so, ...
- 11