JIT 1.1
the temperature of the sun is approx. 5800 K and it has a radius of 695,500 km. what is the radiant power emitted by the sun?
3.90 x 10^26 W
approximately half of the sun's emitted radiation reaches the top of the earth's atmospehre
false
because Earth is in a state off radiative equilibrium, net radiation (incoming sunlight minus reflected and outgoing radiation) is balanced over its entire surface. In other words, the net energy flux at the poles is equal to the net energy flux at the equator.
false
landsat instruments measure light that is transmitted by the earth's surface.
false
light travels the same speed in water as it does in air.
false
plants appear green because chlorophyll emit radiation in the visible (green) portion of the EM spectrum
false
the earth's atmosphere can be modeled as a blackbody
false
highest to lowest energy
gamma waves, x-rays, uv rays, visible, near-infrared, far-infrared, microwaves, radiowaves
what is the declination angle on Feb 1st?
-17.58
if the atmosphere absorbs 23% of solar radiation entering the earth system and the earth's surface absorbs 48% of the incoming radiation, what is the earth's albedo? assume 0% transmissivity.
0.29
the earth currently emits 396 Wm^-2 of radiation from its surface. This corresponds to a temperature of 289 K. If we were to place on 2 W flickering flameless tealight on every square meter of earth, then how much would earth's temperature increase? assume both are blackbodies.
1 degree Celsius
given two spherical blackbodies that are equal in size. Blackbody A has an average surface temperature of 50 degrees Celsius and Blackbody B has an average surface temperature of 80 degrees Celsius. How much more energy is radiated from Blackbody B than Blackbody A?
1.43 times more energy
what would the maximum solar elevation angle be in Ithaca on the winter solstice?
24 degrees
based on the Earth's energy budget, what percentage of incoming solar radiation does the earth reflect back into space?
30%
on a clear day, what is the value of Shorizontal when the sun is at a 30 degree elevation angle?
578 W/m²
what would the maximum solar elevation angle be in Ithaca on the summer solstice?
71 degrees
what is the wavelength of peak emittance for a normal, healthy human?
9.35µm
the pigment of the object is capable of absorbing ROYGBV light, what color does the object appear?
black
according to Wien's displacement law, which of the following must be true?
as a blackbody grows hotter, the wavelength of maximum emittance will decrease
healthy vegetation reflects what type of radiation?
near-infrared
the pigment of the object is capable of absorbing GBV light, what color does the object appear?
orange
how do electromagnetic and sound waves differ?
sound waves require a medium to propagate
how do electromagnetic waves differ from sound waves?
sound waves require a medium to propagate
a low (<0.3) ratio of reflected visible red to reflected near-infrared light is indicative of healthy vegetation
true
by definition, the sine of an angle is the length of the opposite side divided by the length of the hypotenuse.
true
greenhouse gases absorb infrared radiation.
true
humans emit electromagnetic radiation in the far-infrared range of the electromagnetic spectrum.
true
most radiation emitted by the sun is at a shorter wavelengths than radiation emitted by the earth.
true
the solar elevation angle at solar noon on the Equator is less on the summer solstice than on the fall equinox.
true
the sum of proportions of transmitted, reflected and absorbed radiated energy incident on any surface must equal 1.
true
the sum of the proportions of transmitted, reflected and absorbed radiated energy incident on any surface must equal 1.
true
the temperature of the sun is approximately 5800K and it has a radius of 695,500 km. wiith which portion of the EM spectrum, does its wavelength of peak emittance correspond?
visible (green)
both wave A and wave B are travelling thru space, if the wave crest of A passes over a given point every 5 seconds compared to a wave crest of B that passes the same point every 10 seconds, which of the following must be true?
wave A has a higher frequency and shorter wavelength than B
the pigment of the object is not capable of absorbing ROYGBV light, what color does the object appear?
white