Lecture 27: Resonance, Destructive Resonance, Electromagnetic Waves, Speed of Light, Radio - TV, Distance Determinations using Radar and Lasers

author: Walter H. G. Lewin, Center for Future Civic Media, Massachusetts Institute of Technology, MIT
recorded by: Massachusetts Institute of Technology, MIT
published: Oct. 10, 2008,   recorded: February 2002,   views: 2653
released under terms of: Creative Commons Attribution Non-Commercial Share Alike (CC-BY-NC-SA)
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Information about the Tacoma Narrows Bridge Collapse: http://www.pbs.org/wgbh/nova/bridge/tacoma3.html and http://www.ketchum.org/bridgecollapse.html

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Reviews and comments:

Comment1 koureosh KHAZANI, March 9, 2009 at 4:36 a.m.:

I WONDER IF WE CAN USE A STRONG PULSES OF ELECTROMANETIC WAVE TO DESTROY MISSLESS IN THE AIR.
IF WE KNOW THE LENGHT AND THE DIAMITER OF THE MISSLE WE CAN CALCULATE THE RESONANCE FREQUENCY OF THE MISSLE AT WHICH IT WORKS AS AN ANTTENA.
IF WE CAN TRANSMITT TO THE AIR A STRONG PULSE OF E.M. WAVE WHICH MATCH THE RESONANCE FREQUENCY OF THE MISSLEWE IT
CAN CAUSE AN ELECTRIC CURRENT TROUGH THE MISSLE WHICH CAN CAUSE IGNITION OF THE EXPLOSIVE MATERIAL IN TT AND CAUSE THE EXPLOTION OF MISSLE WHILE THE MISSLE IS STILL THE AIR .


Comment2 zach, April 11, 2009 at 5:55 p.m.:

the resonance freq will be so low that teh waves would dissipate in strength by the time they reach the missile :)


Comment3 chochongeun, March 22, 2012 at 3:15 p.m.:

in the lecture Bo=Eo/c
I don,t know... why?

i know as follows
Bo=Eo/η, η=root(μo/εo)=377(ohm)

please help me...


Comment4 chochongeun, March 22, 2012 at 3:28 p.m.:

I mistake...

Bo=Eo/η, η=root(μo/εo)=377(ohm)(X)

so i think

Ho=Eo/η, η=root(μo/εo)=377(ohm)(O)

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