If you put a light bulb in a microwave and turn the microwave on, the lightbulb will glow then blow.
So why does the one fitted in the microwave by the manufactures not blow?
2006-09-07 00:41:24 · 9 answers · asked by David T 3 in Science & Mathematics ➔ Physics
Because it is behind a metal grille which keeps the microwaves out. (Same reason the microwaves don't come through the door and cook you).
2006-09-07 00:46:07 · answer #1 · answered by S h ä r k G û m b ò 6 · 2⤊ 0⤋
Microwaves are similar to radio waves (or light waves or photons). In a microwave oven, the transmitted microwaves traveling at the speed of light are reflected until absorbed by any object that presents a good "antenna." Metals of a certain size absorb the microwave energy and heat until they spark or melt. The tungsten filament in a light bulb increases its resistance to electric current as it heats up and glows and therefore limits the current. But in a microwave oven there is nothing to limit the absorption of energy until the filament ceases to be a good antenna (blows!).
The light bulb manufacturers place in a microwave oven compartment are placed where they will not become good antennas and should receive little heat if any from the microwaves.
2006-09-07 01:37:59 · answer #2 · answered by Kes 7 · 0⤊ 2⤋
Beacuse light bulb coated by metal plate. Metal plate return microwave.
2006-09-07 02:23:56 · answer #3 · answered by haj_reza_khan 1 · 1⤊ 0⤋
The one fitted in my microwave blew within a week and bulbs are not covered by the warranty.
2006-09-07 00:49:44 · answer #4 · answered by the gunners 7 · 0⤊ 2⤋
That bulb is protected by a metal grill and then a hard-borosilicate glass.
2006-09-07 00:54:09 · answer #5 · answered by i_Abhishek 2 · 2⤊ 0⤋
my god.......
why the energy and wave do not "come out" of the oven. it has nothing to do with metal plates or frames or something relevant.
as you may kknow i you put something metallic inside a microwave oven it will be a bad thing to do.
for your information and trust me i am an RF engineer there is a formula that relates the wavelength and cut of frequencies (to make it simple)
the reaosn that all these happen are due to the exact and corect dimensions of the camber. anything ouside of these diameter would not od the trick . it is due to the dimensions a repeat.
consider it as waveguide that has the characteristic of propagating the wave but attenuate or cut it off as well.
for each frequncy thare are specific waveguides that relate to the wavelength that exhibit these properties. onw should pay attention in order to use this to attenuate a "signal" or avoid it in the waveguide dimension is he want for his signal" to propagate.
i hopei made myself clear
2006-09-07 01:06:42 · answer #6 · answered by Emmanuel P 3 · 0⤊ 3⤋
The light is an illusion.
2006-09-07 00:46:57 · answer #7 · answered by Sgt Squid 3 · 0⤊ 2⤋
it is covered by borosilicate glass
2006-09-07 02:54:22 · answer #8 · answered by sami1989 2 · 0⤊ 1⤋
it is a magical lightbulb
2006-09-07 00:46:19 · answer #9 · answered by mumblewords 2 · 0⤊ 2⤋