Lecture 2 EMR

Question 1

Name 3 Sources of EMR

Answer 1

Solar
Terrestrial
Artificial

Question 2

3 types of atmospheric scattering

Answer 2

Rayleigh - gas molecules in upper atmosphere
Mie - when particles are same diameter as radiation wavelength
Non-selective - Particles larger than radiation

Question 3

3 wave types of radiation is measured

Answer 3

Energy reflected from sun
Radiation emitted from objects
Radiation reflected when instrument sends out a signal,

Question 4

Visible Spectrum

Answer 4

Blue - 400-500nm
Green 500-600nm
Red 600-700nm

Question 5

Infrared Spectrum

Answer 5

Near IR 0.7 - 1 µm
Shortwave IR 1- 3 µm
Mid IR 3 - 5 µm
Far IR 5 µm - 1 mm

Question 6

What is Far Infrared known as

Answer 6

Thermal infrared

Question 7

Microwave Spectrum

Answer 7

> 1mm

Question 8

What changes the type of atmospheric scattering?

Answer 8

The wavelength of the incident radiant energy
The size of the gas molecule, dust particle and/or water vapour droplet encountered

Question 9

Atmospheric windows

Answer 9

Bands in spectrum where absorption is least

Question 10

Primary absorbers of EMR

Answer 10

Ozone
Carbon dioxide
Water Vapour