Intro and EM

Question 1

What is remote sensing?

Answer 1

It is the science of acquiring information about the earth surface without getting in contact with it.

Question 2

Energy travels in

Answer 2

electromagnetic waves

Question 3

What are the two properties of every wave?

Answer 3

Wavelength and frequency

Question 4

The distance between two successive crests is

Answer 4

wavelength

Question 5

The number of cycle of wave passing a fixed point per unit of time is

Answer 5

frequency

Question 6

The longer the wavelength the lower/higher the frequency?

Answer 6

lower

Question 7

The electro magnetic spectrum ranges from Gamma to ….

Answer 7

microwave

Question 8

What is the shortest wave length?

Answer 8

Ultra violet

Question 9

The primary colors from which other colors on the visible light portion of the electromagnetic spectrum can be obtained are…?

Answer 9

Blue, green and red

Question 10

Which wave on the spectrum has the longest wavelength and the shortest frequency?

Answer 10

Radio waves

Question 11

I am shorter than radio waves but I have a higher frequency than that bitch, 🙄 who am i?

Answer 11

Microwaves

Question 12

The wave that is applied in RIS for thermal imaging and communication is called?

Answer 12

Infrared

Question 13

The type of wave applied in germicidal lamps, black light and UV spectroscopy is called?

Answer 13

Ultraviolet waves

Question 14

Shortest in the spectrum with the highest frequency is

Answer 14

Gamma rays

Question 15

Applied in medical imaging, security scanning and materials testing is

Answer 15

X-rays

Question 16

What is spectral resolution?

Answer 16

ability of the sensor to separate EM into small intervals (bands)

Question 17

Three main types of sensors used are

Answer 17

Optical, Radar and LiDAR

Question 18

With the passive type of remote sensing, what is the source of energy?

Answer 18

The sun, earth or atmosphere

Question 19

Source of energy in active remote sensing is

Answer 19

remote sensor system

Question 20

The angle between the sun and a line perpendicular to a surface is called

Answer 20

solar incidence angle

Question 21

The solar incidence angle for a horizontal surface is called

Answer 21

Solar zenith angle

Question 22

The finer the spectral resolution the ….., the wavelength range for a particular channel or band

Answer 22

narrower

Question 23

The length of time for a satellite to complete one entire orbit circle is called

Answer 23

Temporal resolution

Question 24

The two basic theories that describe EMR are

Answer 24

the wave and particle theory

Question 25

EM energy is composed of discrete units called

Answer 25

photons or quanta

Question 26

The theory that is most useful in quantifying the amount of energy measured by the sensors is

Answer 26

Particle theory

Question 27

The wavelengths at which the radiation can penetrate the atmosphere with the little interference are called

Answer 27

Atmospheric windows

Question 28

Recording devices that measure emitted radiation or sound is

Answer 28

Sensor

Question 29

The type of sensor that provides its own energy source for illumination is called an/a

Answer 29

Active sensor

Question 30

What are the three forms of interactions between radiation and the target?

Answer 30

reflection, absorption and transmission

Question 31

The unpredictable diffusion of radiation by particles in the atmosphere is called

Answer 31

Scattering

Question 32

What type of scattering is responsible for the blue and red skies?

Answer 32

Rayleigh

Question 33

……..results in the effective loss of energy to atmospheric constituents.

Answer 33

absorption

Question 34

Where the angle of reflection equals the angle of incidence is

Answer 34

Specular

Question 35

Where reflectance is equal in all direction is

Answer 35

diffuse

Question 36

The ratio of reflected energy to incident energy as a function of wavelength is called

Answer 36

spectral reflectance

Question 37

The light energy per unit time impinging on a surface, normalized by the surface area is called

Answer 37

irradiance

Question 38

……is simply how much light the instrument sees from the object being observed.

Answer 38

radiance

Question 39

When radiation is redirected from its original path, we call it

Answer 39

scattering

Question 40

When ozone, CO2 and water vapor absorbs radiation, we call it

Answer 40

absorption

Question 41

The two main interactions in the atmosphere are

Answer 41

scattering and absorption

Question 42

Smooth surface bouncing radiation in one direction is

Answer 42

specular

Question 43

rough surface bouncing energy in all directions is

Answer 43

diffuse

Question 44

Leaves in summer have more chlorophyll hence they absorb …… wavelength reflecting green.

Answer 44

Red and blue

Question 45

In Autumn, chlorophyll is reduced hence it exhibits …..

Answer 45

yellow to red color

Question 46

Out of the five human body sensors, how many can be considered as a form of remote sensing?

Answer 46

3

Question 47

The EM spectrum is divided into narrow wavelength intervals called

Answer 47

band or channel

Question 48

Energy detected are stored in

Answer 48

bands

Question 49

Bands are numbered from?

Answer 49

1