All Questions
7 questions
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How to measure light intensity in a room?
Does anyone know how I would go about measuring the light intensity in a room? I'm not interested in knowing the lux reading, I would like to measure the $W/m^2$ due to thermal radiation in my ...
- 31
4
votes
1
answer
4k
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Diffrence between thermionic emission and photoelectric emission
Thermionic emission involves heat energy to excite the electron and remove it. In the photoelectric effect, a beam of light is involved.
As per my understanding heat and photons, both are energy. Heat ...
1
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2
answers
110
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What is black-body equivalent of UV part of solar spectrum?
If all non-UV light was filtered from sunlight, does this approximate a different type of black body radiation? Regular sunlight has a black-body temperature of 5777 K.
This is in relation to the ...
- 23
8
votes
1
answer
5k
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Black Bodies and appearing black
I know a black body is an object that absorbs all wavelengths of light, and also emits all wavelength of light too back out, but if it emits all wavelengths of light, why does it appear black, as all ...
- 283
1
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0
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1k
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Why does the intensity of radiation decrease as the frequency increases?
Image Source
I am well aware of that what I am going to ask may sound really stupid and easy to answer so forgive my ignorance on the matter. Basically, why does the intensity of radiation decrease ...
- 123
1
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1
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1k
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Physics and Skin Color: What differences do physicists observe between different skin colors?
I majored in social sciences, so I haven't taken a science class since 1999, so forgive me if I don't ask this right.
What difference would skin color make from a physics perspective?
Would there be ...
- 13
2
votes
1
answer
12k
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Why are umbrellas black?
Why are umbrellas specifically in black? Of course we do have colored ones, but black is the majority. Is there any scientific reason behind it?
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