2006-09-19 07:31:55 · 7 answers · asked by Wim 2 in Science & Mathematics ➔ Physics
http://en.wikipedia.org/wiki/Image:Atmospheric_electromagnetic_transmittance_or_opacity.jpg
(Wikipedia image of Earth's atmospheric opacity)
Atmospheric opacity refers to how well the atmosphere blocks the rays. For example, glass does not block visible light, but a wood does, therefore the wood is opaque to visible light, but glass is not.
From the graph, you can tell the atmosphere blocks most rays except for a bit with wavelengths between 0.4 and 0.7 micrometers (which is visible light) and between 5cm and 15 meters, which is radiowaves.
2006-09-19 07:41:30 · answer #1 · answered by wdmc 4 · 2⤊ 0⤋
The radiation from the sun reaching the earth's surface is only 70% of the radiation energy from the sun reaching the atmosphere . Hence 30% is blocked by the atmosphere.The radiation spectrum that is called EM spectrum is a map of the radiation power ,which includes the visible part to the human eye ,basically indicates the different colors as a function of frequency.
So we have an energy loss but not a power loss in the spectrum.due to the atmosphere.
The higher frequency of Em spectrum would be blocked not by the atmosphere but by the Van Allen Belt which is a region where the Earth's magnetic field is prevalent . The Magnetic field deflects the Harmfull to humans radiation In the form of beta and gamma.
2006-09-19 07:52:35 · answer #2 · answered by goring 6 · 0⤊ 0⤋
Most short waves like gamma, x-ray and a fair amount of UV get blocks optical get through and some IR but water vapour tends to absorb IR and microwaves. Once into radio wavelengths the atmosphere is transparent.
2006-09-20 02:48:34 · answer #3 · answered by Mark G 7 · 0⤊ 0⤋
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2016-12-18 13:11:42 · answer #4 · answered by omparsad 4 · 0⤊ 0⤋
gamma and, up until recently, UV to some degree as well.
2006-09-19 07:40:39 · answer #5 · answered by pito16places 3 · 0⤊ 0⤋
gamma rays
2006-09-19 07:34:45 · answer #6 · answered by dik 3 · 0⤊ 0⤋
cosmic rays, gamma rays
2006-09-19 07:42:01 · answer #7 · answered by sloop_sailor 5 · 0⤊ 0⤋