2006-10-23 09:24:04 · 17 answers · asked by Richard C 2 in Science & Mathematics ➔ Physics
What is your definition of "truly" transparent? If it means that transmission is exactly 1, then only a vacuum is truly transparent. Almost all other materials absorb some amount of radiation as some wavelength.
Water is not truly transparent, since it actually absorbs most light, but allows blue at about 511 nm to be transmitted and transmitts nothing beyond about 2 um.
Air has lots of absorption lines from the gases and moisture in the air and only transmits infrared between 3-5 um and 8-14um.
Uncoated glass only has about 92% transmission in the visible and likewise transmits nothing past abtou 2.5 um.
2006-10-23 09:43:18 · answer #1 · answered by arbiter007 6 · 1⤊ 0⤋
Air, Vacuum
2006-10-23 16:30:32 · answer #2 · answered by RENDEVOUS 4 · 0⤊ 0⤋
Have you ever walked into one of those plate glass doors and banged your head so hard you thought you wouldn't be able to stand? They're transparent!
2006-10-23 16:35:31 · answer #3 · answered by used to live in Wales 4 · 0⤊ 0⤋
Yes... at the smallest level of existence "everything" is quite transparent.
2006-10-23 17:08:08 · answer #4 · answered by Anonymous · 0⤊ 0⤋
A politician
2006-10-23 16:31:50 · answer #5 · answered by DeeDee 4 · 0⤊ 0⤋
Yes. A vacuum.
2006-10-23 16:27:55 · answer #6 · answered by antony965314 3 · 1⤊ 0⤋
Yes, the truth.
2006-10-23 16:27:27 · answer #7 · answered by FrogDog 4 · 0⤊ 0⤋
air
2006-10-23 16:32:21 · answer #8 · answered by Anonymous · 0⤊ 1⤋
air
2006-10-23 16:27:25 · answer #9 · answered by Ed 1 · 0⤊ 1⤋
air
2006-10-23 16:27:02 · answer #10 · answered by Anonymous · 0⤊ 1⤋