tech99's latest activity

Regarding the spacing of resonance as you vary the wavelength (or frequency). Imagine a low frequency analogy. Take transmission line 5m...

If you change wavelength, the resonances actually occur at fixed intervals of frequency, so are not exactly uniform wavelength intervals.

Isolated systems are used for safety on construction sites etc. A transformer is used where the secondary is not connected to earth. A...

Isn’t the system statically indeterminate? [EDIT - No it isn't! See later posts.] Considering only external forces, it is trivial to...

I was assuming that the supports were knife edges so that the structure could lift off.

A reaction in the hinge O has two components. A reaction in the hinge A has only a vertical component. We have three unknowns. Find them...

Good afternoon, This is not Paul, but rather his son Robert. I am very sad to write here that my dad passed away on Saturday...

My ideas are as follows:- If we are to ignore weights, the structure cannot be in equilibrium. So we must assign a weight W to the total...

Is the spectrum analyser set to a very narrow bandwidth so that the problem is exaggerated? You seem to obtain a bandwidth of just a few...

An example of a device where positive and negative charges flow in opposite directions is the demountable discharge tube made by...

Also, thicker wire will hold more ice. Ice on overhead wire is bad news. Heavy ice on wires alone is not necessarily why they come down...

I think the basis of the first understanding the proton was the cathode ray tube of Eugene Goldstein in 1886. In essence, the tube was a...

For the case of a standing wave, there is no net flow of energy - the energy is stored. The electric and magnetic fields are no longer...

I think what is being described is a zone plate.

Is not the shape of the field simply the superposition at every point of radial fields from more than one body? This gives the curvature.