tech99's latest activity
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tech99 replied to the thread High School What Medium Does Light Travel Through in Space?.Maxwell noticed that the "cgs" units of permittivity and permeability were related by a number equal to the speed of light. So that the... -
tech99 reacted to hokhani's post in the thread Undergrad Radiation in classical and quantum mechanics with
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From classical view, even in a stationary state of an atom electrons have acceleration and they must radiate. -
tech99 replied to the thread High School Conclusions from Thomson’s cathode ray tube experiment.It seems that they did know that charge flowed in a circuit. Thompson himself tries to measure charge by the time it takes to accumulate... -
tech99 replied to the thread Great circle between two points on the Earth's surface.Not sure here but are you assuming that latitude is a great circle? -
tech99 replied to the thread High School Why the bottom of a rolling wheel has zero velocity.Is this definition universal, so it will hold if the wheel has a flange protruding below the contact surface, as on a train? -
tech99 replied to the thread Undergrad Radiation in classical and quantum mechanics.I suppose in a simple way that if we accelerate a charge using an alternating electric field, the radiated energy will, as always, be in... -
tech99 replied to the thread Undergrad Mass-and-spring model of parametric amplification.If the signal and pump are both applied to the mass, then the deflections will add. But to produce parametric action the spring... -
tech99 reacted to Nugatory's post in the thread High School Why the bottom of a rolling wheel has zero velocity with
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That one confused me for a moment, and then I realized why it had to be specifically a "train" wheel - the flange extends below the... -
tech99 replied to the thread Copper piping and cathodic protection?.I suspect that providing cathodic protection to the interior of pipes is problematic, because the current will tend to flow locally... -
tech99 replied to the thread Copper piping and cathodic protection?.I would be concerned about the toxicity of zinc. -
tech99 replied to the thread Why does the base of the stapes (oval window) have a lower amplitude in the middle ear?.I saw your question and do not know how to reply directly to you. The lever arrangement appears to give a step down in amplitude from... -
tech99 replied to the thread Limitations of the CQMI method to assess causality of s-parameters.I think the underlying issue you have is that you need to undo the embedded test fixture parameters from your overall measured... -
tech99 replied to the thread Why does the base of the stapes (oval window) have a lower amplitude in the middle ear?.You ask about pressure or force at the oval window. In a fluid we have pressure and in a system of levers we have force. In hydraulics... -
tech99 reacted to DrBanana's post in the thread Why does the base of the stapes (oval window) have a lower amplitude in the middle ear? with
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Textbooks: 1. Guyton and Hall Textbook of Medical Physiology, 14th edition: " “Impedance Matching” by the Ossicular System: The...