quality posts: 16
amreli wrote:Different media...light is electromagnetic energy/radiation/made of photons/waves. Sound waves are the transmission of pressure through matter (which is why sound doesn't travel in a vacuum).
Also, this specifically relates to harmonics, which are waves that have frequencies that are multiples of the fundamental frequency, for example a fundamental tone of 440 Hz would have a second harmonic of 880 Hz (and half the wavelength). Visible light has frequencies between around 400–790 THz(wavelengths ~390nm to 760nm), which since the highest frequency is still less than double the lowest, means it doesn't even get to the second harmonic. If any of that makes sense.
It kinda doesn't. You can have sound waves of a single frequency with no harmonics (just avoid non-linearities), and just because you can't see the 2nd harmonic of, say, 550nm green, doesn't mean you won't get burned by the 275nm UV if you pass it through a non-linear medium.
In fact, y'know those green laser pointers everyone is supposedly blinding airplanes with? There's no green laser in those -- they have an infrared laser shining through an optically non-linear crystal to generate the second harmonic.
amreli wrote:I did sound waves/harmonics because that was more appropriate to a middle school science fair project than light waves.
But if you say they're sound waves, then they're sound waves. Obviously. ;)
Big Ogre Cudgels!
2009 Nov 19
2009 May 15
quality posts: 12
Kilo24 wrote:The equation is lambda (which is wavelength) = velocity divided by frequency. This equation is a fundamental rule of how waves are handled mathematically. Velocity is how fast the wave is moving. Frequency is how often the wave cycles through its wavelength; measured in Hz, it's the reciprocal (1 divided by) of the period (the amount of time it takes the wave to move through one wavelength.)
Thank you Kilo. Now us muggles can at least attempt to explain the awesomeness of this shirt when we are undoubtedly gonna be asked. I don't really care what it means or if it is appropriate to the theme, I voted for it because it is just mesmerizing. And I love the colors! And it is appropriate for all ages and genders. My radioman hubby will also attempt to 'explain' this shirt to me when I get it for him, I will just smile and nod, hehe.
oops, pardon me, i wooted