All Questions
Tagged with electromagnetic-radiation wavelength
206
questions
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115
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Does microwaves nevertheless pass through smaller slits?
It is known that the Foucault currents prevent the microwaves to leave a microwave oven (MWO). The waves can not pass tru several times smaller openings than their wavelength because the grid of the ...
- 651
1
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2
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354
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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
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4
answers
103
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Light as a wavelength [closed]
I am learning that light is an electromagnetic wave, does this wave travel in every direction simultaneously from the source of light? I am trying to visualize this concept but I haven’t seen an ...
- 11
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0
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77
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EM scattering cross section, antenna directivity and its interpretation
The formula (35.25), see Slater, $\bar A_r = \frac{\lambda^2}{4\pi}$ is probably the most important formula in radar and/or antenna engineering. It says that the average absorbing cross section of ...
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If a human was moving fast enough how bright would the blue-shifted heat be? Would it be detectable by an average human eye on an average night?
I guess another way to answer this question would be if our eyes had the capability to detect the peak black-body wavelength that is emitted by humans would it be enough radiation to detect if we were ...
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290
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What is the distribution of different wavelengths in single ray of white light? Does it remain constant?
Given the sun as the source of light for the above question, does the incident of different visible wavelengths same on a given surface, at a particular time and duration, even if the sun is rotating ...
- 13
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4
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166
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Is energy rule violated here? [closed]
We know that for an EM radiation , energy is given by :
$$E = \frac{hc}{\lambda}$$
.
Where $h$ is Planck's constant , $c = 300000000$m/s and $\lambda$ is wavelength of the radiation.
Clearly, energy ...
- 239
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4
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156
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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 ...
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-2
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1
answer
58
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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
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3
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171
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Length and width of photon - check logic
so if $E = h\nu = \frac{h c}{\lambda} = pc$ where $\lambda$ is the photon's wavelength, $h$ is planck's constant, and $p$ is the photon's momentum
and
$L = \frac{p}{h}$ where L is length and p is the ...
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6
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6
answers
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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
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3
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183
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What are the advantages of radio spectroscopy? [closed]
What is the main purpose for radio spectroscopy? What information of the atomic structure of atoms can we gain from using radio frequency radiation rather than X-rays? Since the wavelength of radio ...
- 324
0
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0
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105
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Why half-wave dipole is the most efficient one in comparison to other electrical lengths?
I have a problem on the understanding of a half-wavelength antenna. Namely, why is the half-wave antenna has a highest power emission. Considering Far Field factor F($\theta$), which is known from the ...
- 591
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91
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Walkie talkie antenna
how is it possible that the antennas of the walkie talkies are so small, if the frequencies they receive have wavelengths of more than 30 cm? Maybe the why's are quarter wave antennas? and for pulsed ...
- 11
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3
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547
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Does Wave-Particle Duality Mean "Particles" are Just Waves With Short Wavelengths?
I have the following question about wave-particle duality:
Are particles really just waves with short wavelengths?
If this is correct, would it then be accurate to say:
"everything in the ...
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