In bolometers, incoming radiation warms a strip of material. this material will have a large thermal coefficient of resistance, leading to a (small) resistance change in the material. the inventor, Samuel Pierpoint Langley apparently used this to detect a cow from 1/4 of a mile away using a...
To the best of my knowledge: a powerful oscillation at one frequency means more energy is required to make same medium oscillate at another frequency.
Since sound perception works by detection of air oscillation, could a sufficiently powerful oscillation at an inaudible frequency (to humans)...
Many scientists are regarded as geniuses based on their work (Einstein, Newton, etc).
What is it about their work that is so clever that few others could have done it?
I boiled a solution of sodium hypochlorate down to make what I thought was sodium chloride and sodium chlorate - a light brown coloured powder.
However, this evening when I looked at it again it had formed a darker brown powder that was almost like soil with a few white clumps here and there...
Very interesting, thank you!
If other agencies said no (due to lack of knowledge on the effects of the treatment) could the patient and doctor collectively overrule this?
Also for the purposes of the question, assume the patient was willing to fund the treatment himself.
(I know this is a little farfetched but please just explains the logistics of how he'd go about doing this)
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Imagine a key medical researcher discovers he has a terminal lung cancer.
He knows the operation and treatments necessary to save himself because he's a genius and an expert in the...
Imagine a motor, spinning a rotor blade around and around and around and around and around...
How does the angular velocity of the rotor blade, and the torque affect the thrust produced?
So I've read up a little bit on Langley's bolometer, a device made in the 19th century using two strips of platinum and a galvanometer. From what I can gather, a galvanometer works because the temperature of one of the strips changes in response to incoming photons (or other particles), and this...
So I have some big speaker amplifiers at home, and they sometimes pick up radio interference from the CB enthusiast next door (he uses AM, so I'm guessing this is inducing a signal inside my amplifier which amplifies it into my speakers). It isn't really a big problem so I'm not looking for a...
To the best of my knowledge, thermal imaging (with a thermograph as the end results) is performed using arrays of thermopiles. This can become hugely expensive and is the reason fire services sometimes have trouble affording thermal imaging cameras.
Snakes have heat sensitive ion channels...
Hi,
I'm interested in trying to understand Einstein's field equations, I'm a physics student due to start an astrophysics course next year. I was just wondering if someone could give me some advice where to start?
So I was looking up what causes thunderstorms online and found this:
"As hail moves within the cloud it picks up a negative charge by rubbing against smaller positively charged ice crystals. A negative charge forms at the base of the cloud where the hail collects, while the lighter ice crystals...