Recent content by marcusl

I suggest that you use capitalization and punctuation in future posts. It’s pretty hard to parse your thoughts without them.

There's no R in the formula for power, only for the voltage generated by a resistance. A resistor delivers a power spectral density S=kT W/Hz to a matched load.

I’m confused. Johnson noise at 290K is -174 dBm/Hz or -204 dBW/Hz. How do you get -187?

That app in the previous post has a nice guided tour, with more to come. Here's a link to a short news story with some additional amazing images https://physics.aps.org/articles/v18/122

Measure twice, cut once.

In my experience, it's common for the client to own everything they've paid for without having to acknowledge the source (consultant). The "non-disclosure" part of the NDA's that I've seen and/or been party to expire after a certain time, however, usually five years.

Which is worse?

If the breadth of the road is c, normal to its length, then the breadth b of a bus must also be measured normal to its direction of travel. (Thus b is bus width, not length.)

Do you have a specific question?

You seem to be mixing up concepts that are unrelated. The photoelectric effect is a quantum phenomenon while antennas, signals and filters are classical.

So you’ve invented a room-temperature superconductor?

You may not be aware that there are no room temperature superconductors—yet. Superconductors expel magnetic fields, so one way to tell if you have a superconductor is to place it in a uniform magnetic field, cool it through the transition temperature, and watch the external fields change.

See also this thread for other quotes: https://www.physicsforums.com/threads/what-do-these-famous-quotes-reveal-about-the-minds-of-great-scientists.767804/

This is correct. A finite sequence sampled from a longer continuous waveform cannot be exactly reconstructed. The energy lost can be calculated by setting up an eigenvalue problem whose kernel is a sinc function (of course!). Eigenfunctions in the continuous case are the prolate spheroidal wave...

Reference?