Electromagnetic Spectrum

Question 1

Highest Point in the wave

Answer 1

Crest

Question 2

Lowest Point in the wave

Answer 2

Trough

Question 3

Amplitude

Answer 3

Distance between midpoint and crest/trough

Question 4

Wavelength

Answer 4

Distance between two identical points on wave

Question 5

Period

Answer 5

The time it takes for 1 wave to pass a point.

Question 6

Frequency

Answer 6

The number of waves that pass a point per amount of time.

Question 7

Does light behave in a dual nature? What as?

Answer 7

Yes, as both

Particles and Waves

Question 8

What is the fundamental unit of EMS?

Answer 8

Photon

Question 9

What wavelength do all active systems use?

Answer 9

0.1 - 100cm (microwave region)

Question 10

How fast do photons move at?

Answer 10

300,000km/h

Question 11

Lowest Frequency/Longest Wavelength?

Answer 11

Radio Bands/Waves

Question 12

Upper end of EMS? 2 types?

Whats smaller than that?

Answer 12

Gamma rays and X-rays

Smaller is Ultra Violet

Question 13

Spectrum of visible light (Blue, Green, Red?

What UMs for each?

Answer 13

• Blue light = 0.4 μm → 0.5 μm
• Green light = 0.5 μm → 0.6 μm
• Red light = 0.6 μm → 0.7 μm

Question 14

Blackbody, what is it?

Answer 14

A Blackbody is defined as an object that absorbs all incoming radiation and emits all energy at full efficiency for all wavelengths.

Question 15

All things emit radiation is they are above?

Answer 15

-273C or 0K

Question 16

Radiance (Mλ) is defined as:

Answer 16

the total amount of energy measured at the sensor representing a point on the ground.

Question 17

3 different energy-matter interactions?

Answer 17

1) transmittance - some radiation penetrates into certain surface materials such as water;
2) absorption
3) Reflection/scattering

Question 18

Atmospheric Attenuation

Answer 18

Incoming energy is weakened by atmosphere.

Question 19

Explain transmittance?

Answer 19

the portion of light that passes though a medium

Question 20

3 different types of scattering

Answer 20

Releigh scattering = particles smaller than wavelengths
Mei scattering = non-molecular scattering
Non-select scattering = lower part of atmosphere

Question 21

common effects of non-selective scattering

Answer 21

fog and cloud

Question 22

Diffuse Reflectors

Answer 22

rough surfaces which reflect uniformly in all directions. These reflectors yield a reflection pattern which is generally uniform.

Question 23

Specular reflectors

Answer 23

where the angle of reflection is equal to the angle of incidence

Question 24

Bidirectional Reflectance
- when lots of reflection is occurring around.
What the result?

Answer 24

The result is that the reflectance off one surface is composed of both a diffuse as well as a specular component