Chapter 2 Terms

Question 1

Electromagnetic Spectrum (EMR)

Answer 1

1. Changes in electrons/wavespeed.
2. All objects emit/reflect EMR (unless at absolute zero)
3. Cannot be created or destroyed

Question 2

EMR Wave Properties

Answer 2

1. Wavelength- distances between waves.
2. Frequency- number of crests passing a fixed point in a given time.
3. Amplitude- the height of each peak.

Question 3

3 Ways an EMR wave can be emitted by surfaces

Answer 3

1. Transmission- transparent to certain wavelengths and goes through it uninhibited.
2. Absorption- energy absorbed by surface/substance, has to emit radiant/energy in another form.
3. Reflection- wavelength bounces of surface which changes its direction.

Question 4

Passive Remote Sensing

Answer 4

1. Uses reflected/emitted energy from sun for EMR.

Question 5

Active Remote Sensing

Answer 5

1. Sensor shoots out energy to read reflected energy.

2. Radar, Lidar.

Question 6

Types of Scattering

Answer 6

1. Defintion- energy is spread out/scattered.
2. Clear Atmosphere Scattering- UV scattered in high altitudes.
3. Mie Scattering- small particles scatter EMR.
4. Non-Selective Scattering- large particles scatter EMR.

Question 7

Rayleigh Scattering

Answer 7

1. Particles scatter shortwave radiation, makes sky blue.