DaveE's latest activity
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DaveE reacted to Andy Resnick's post in the thread A When should I analyze optical problems using ray tracing vs. wavefront analysis? with
Like.
The branch of optics characterized by the neglect of wavelength (the limiting case of λ→ 0) is geometrical optics, which models the... -
DaveE reacted to Baluncore's post in the thread I Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms with Like.
Where two phasors or vectors cancel, the result is not zero, it is just vanishingly small. Any phase or amplitude noise present, will...
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DaveE replied to the thread I Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms.Yes! The plane waves in all of the physics books aren't physically realizable. You just can't have two different EM waves that cancel...
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DaveE reacted to Dale's post in the thread I Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms with Like.
It isn’t. Can you see why? Think of the Poynting vector. In the field that is not canceled. E.g. if there is complete destructive...
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DaveE reacted to berkeman's post in the thread I Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms with Like.
No. You are not asking about two parallel beams propagating in the same direction. You are asking about two opposing beams -- have you...
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DaveE reacted to TensorCalculus's post in the thread I Problem in understanding instantaneous velocity with Like.
One, very unmathematical (and a bit imprecise), way to think about instantaneous velocity intuitively is by thinking of the speed the...
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DaveE replied to the thread B The wave function of the electron doesn't collapse when passing through air?.IDK. I'm not qualified or inclined to solve this for you. But I would take a serious look at the classical limit. Suppose King Kong is...
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DaveE replied to the thread Mw7.7 - 16 km NNW of Sagaing, Myanmar.This is interesting IMO. Definitely above my pay grade, but still interesting. https://www.nature.com/articles/s41598-022-27159-x
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DaveE replied to the thread B The wave function of the electron doesn't collapse when passing through air?.It's about the probability that a single electron interacts with something, like air molecules. There is no minimum. Even in a vacuum...
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DaveE replied to the thread Suggestion Make inactive users visible by formatting username appearance.I don't see "last seen" date in for those two.
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DaveE replied to the thread Suggestion Make inactive users visible by formatting username appearance.I do; date joined & last seen.
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DaveE reacted to Baluncore's post in the thread Beauty of old electrical and measuring things, etc. with Like.
The 12AX7 continues to be used in guitar amplifiers today. I don't know why they worry you, it is just a matched pair of N-channel FETs...
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DaveE replied to the thread Beauty of old electrical and measuring things, etc..It might be that I think ±300V power supplies are a PITA. It might be the reliability of things that require heaters and vacuum seals...
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DaveE replied to the thread Beauty of old electrical and measuring things, etc..I love this old steampunk data sheet. Especially the draftsman lettering. Thank god I never met one of these tube amps IRL, they look...
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DaveE replied to the thread Defining Analog Computer Power.Also, you might look into digital communication systems. Even though this text is sent, received, and is quintessentially digital. It...
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