There's this video of standing waves where a wave-generator oscillates one end of a string in simple harmonic motion and the other end is fixed and the energy reflects off the other end and you get a standing wave.
Q1. Is a wave a moving pulse (a single traveling point) that is traveling through the string and where it goes, it induces motion and the previous points continue to move due to inertia? I think this is wrong - a wave isn't a pulse right - it isn't localized to a specific region for some time t1?
Instead a wave exists all along the wire upto the head of the wave and the head is constantly advancing till it hits the fixed node?
It's the equivalent of an infinite number of little green men strung out on the wire and pulling on the wire, each working to a common formula (sin, cos or whatever) that tells them how much force to exert at any given point of time right?
vs one guy running through the wire and exerting some force and letting inertia take over once he's moved on?Q2. Is this how EM waves work?
Waves - how do they work: https://www.youtube.com/watch?v=-gr7KmTOrx0
|Why bother with a post grad course - waste of time?||17-10-2016|