Oops, typo. Speed of light and electromagnetic waves is 186,000 mi/sec or
300,000 km/sec as noted. Speed of sound (audio wave) is dependent on the
medium and altitude/density in the case of air, generally 742 mi/hr at sea
level.
As corrected by Mike and Aleksandr, my American Heritage 2nd Coll. Ed. '82
incorrectly listed the electromagnetic spectrum as going down to 0 Hz and
also listed heat where sound should be, will have to let them know about
that. ;-) But it and Webster's 9th New Collegiate do list it and the radio
frequency spectrum as starting with Extremely Low Freq. <3 KHz, Very Low
Freq. 3 K-30 KHz, LF 30 K-300 KHz, etc.
Back to our discussion, a comparable test would be to take the temps of
different colors of the same type of car, say something common like Neons or
such, to get a reasonable consistency on metal thickness, paint thickness
and layers, etc. Can't account for dirt or wax though. ;-)
Gary Lin
I wrote:
> A little bit more to add, but first obviously Don means 300,000 kph or
> 186,000 mph for the speed of light, and includes all others except for
> Audio which is ~742 mph.
>
> The electromagnetic wave spectrum starts at Audio (0 Hz, though you
> generally don't hear <20, to 20 KHz) then goes through Radio (20 KHz
> -300,000 MHz), Micro, Infrared (heat), Visible Light, Ultraviolet, X,
> Gamma, Cosmic. Wavelength starts at infinity and shortens as frequency
> increases.
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