Lecture #5 [Climate Controls]

Question 1

Radiation

Answer 1

electromagnetic waves, classified by wavelength

Longwave= lower energy

Shortwave= higher energy

Question 2

1 EMISSION OF RADIATION

Answer 2

all substances emit radiation as long as their temperature is above absolute zero
(-273.15*c or 0 K)

Question 3

Radiation Laws (5)

Answer 3

#1 EMISSION OF RADIATION
all substances emit radiation as long as their temperature is above absolute zero
 (-273.15*c or 0 K)

#2 BLACKBODY & PLANCK
the sun is very simialr to an "ideal emitter" (or "Black Body") "The shorter the wavelength, the greater the intensity of the energy flux"

#3 THE STEFAN-BOLTZMANN LAW
if the substance is an ideal emitter (black body) the total amount of radiation given off is proportional to the fourth power of its absolute temperature.

#4 TEMPERATURE AND WAVELENGTH
as the substance get hotter the wavelength at which radiation is emitted will become shorter

#5 SELECTIVE EMISSION AND ABSORPTION
some substances emit and absorb radiation at certain wavelengths only [mainly true of gases]

Question 4

3 THE STEFAN-BOLTZMANN LAW

Answer 4

if the substance is an ideal emitter (black body) the total amount of radiation given off is proportional to the fourth power of its absolute temperature.

Question 5

4 TEMPERATURE AND WAVELENGTH

Answer 5

as the substance get hotter the wavelength at which radiation is emitted will become shorter

Question 6

5 WEIN’S LAW

Answer 6

if the object is hot [sun] its max amount of radiation at shorter wavelengths - the opposite is true for cold

Question 7

4 TEMPERATURE AND WAVELENGTH

Answer 7

as the substance get hotter the wavelength at which radiation is emitted will become shorter

if the object is hot [sun] its max amount of radiation at shorter wavelengths - the opposite is true for cold

Question 8

5 SELECTIVE EMISSION AND ABSORPTION

Answer 8

some substances emit and absorb radiation at certain wavelengths only [mainly true of gases]

Question 9

Shorter wave lengths and higher radiation intensity is related to which type of emissions

Answer 9

high frequency
short wavelength
higher energy and hotter temp

SO VISIBLE AND ULTRAVIOLET

Question 10

longer wave lengths and lower rad. intensity is related to which type of emissions

Answer 10

low frequency, long wavelength, lower energy and cool temp

SO INFRARED

Question 11

green house effect

Answer 11

originally the sun emits radiation and some meets surface and is re-radiated outward and bounces again and even less is re-emitted so over all more heat espaces out into sppace

human enhanced GHE makes more re-emmited and re-radiated heat and has less heat escaping into space

Question 12

How are humans causing global warming

Answer 12

by adding more CO2 and other greenhouse gases into the atmosphere we are enhancing the GHE