pgs. 18-22

nope.

3 x 10^8 m/s (186,000 miles per second)

this speed is known as the speed of light. nothing can travel faster.

distance between two successive crests in a wave.

wavelength is the greek word lambda

measured in micrometers, 10^-6m

it is 1/100th the width of human hair. it is what we measure waves in

if small, lots of waves can fit into 300,000 km (the distance light can travel in one second)

if it is large, not many waves will fit into 300,000 km.

number of waves at a fixed point in one second.

greek letter nu.

C = lambda * nu

speed of light = wavelength times frequency

low energy

so low frequency radiation carries low energy

high energy

so high frequency radiation carries high energy.

true

the wavelengths of electro magnetic radiation that an object omits

objects with very high temperature emits high energy at a greater intensity than objects at a lower temperature

so a small increase in temp leads to a huge increase in emitted radiation

E = constant of proportionality*temperature (kelvin)

lambda max = 2897/T which is roughly 300/T microns

the wavelength of maximum emission of an object is related to the object's temperature as the formula above.

when the earth emit's most of its energy near 10 microns

the sun's radiation emits at only .5 microns

wavelengths from .4-.7 microns

the sun emits 44% of its radiation at these wavelengths

shortest visible wavelengths (.4 microns)

has wavelengths shorter than .4 microns.

the longest visible wavelengths (.7 microns)

wavelengths that are longer than .7 microns

earth emits most of its energy at this wavelength

the object will get colder

the object will warm up

the amount of energy absorbed is exactly equal to the amount of emitted energy. this means the temperature will not change at all.

the nature of its surface characteristics.

size, color, texture...

if an object is a good absorber at a certain wavelength, then it will be a good emitter at that wavelength (provided that its temperature allows it to emit at that wavelength)

object that absorbs all of the radiation that strikes it with 100% efficiency

emits the maximum possible radiation

any object that is a perfect absorber and a perfect emitter

earth adn the sun are both examples

temperature of the surface of which radiative equilibrium is reached

radiative eq of the earth is 255 K.

because our atmosphere emits and absorbs radiation

nope.

it absorbs some wavelengths of electro magnetic radiation, and is transparent to others

any object that absorbs and emtis only some wavelengths of electro magnetic radiation

the atmosphere is an example

reigions in the electro magnetic spectrum in which the atmosphere is transparent

presence of gasses such as H2o and CO2 that absorb outgoing infra red radiation.

yup

H2O, CO2 and Methane are

thus the atmosphere is only transparent to some infra red radiation

above absolute zero

temperature of an object

glass

the atomosphere

Station A, the station with snow on the ground, because according to kirchkoff's law, an object that can aborb a wavelength well can emit that wavelength equally as well.

since snow is known to be a black body, and is good at aborbing sunlight rapidly, it is equally known as emitting waves just as fast. The rapid emittion of radiation is going to cool station A down faster than Station B.