In the field of Physics
, Destructive Interference usually refers to the Interference of waves
. Destructive Interference basically refers to the tendency of two opposite
waves cancelling each other out. Sound waves are a good example, and you can see Destructive Interference in action if you have a tuning fork
Basically, when you whack
the fork, the noise coming off the flat faces of the two prongs
is much louder then the noise coming from the corners of them.
I'm not entirely sure how this works, because I came really close to failing physics
. But I've seen (or rather heard) it.
This is actually being used (well, prototype
d right now) in really new cars
- basically, you have large speakers
under the seats
, and then microphones
pick up noise coming into the car. The speakers then generate the opposite sound wave
, and the two cancel each other out for a totally silent
The only other thing I recall is that my teacher
said it should be possible for airplanes
themselves from radar
with destructive interference like this. Radar as mostly based on echoing
, so if the plane had a radar detector that identified the frequency
the radar was using, it could generate the opposite wave and cancel the radar beam out as it comes towards it. I guess the receiver would still get a blip
for a second, but it would at least distort
it after that.