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Electromagnetic Spectrum > Visible light > Flashcards

Visible light Flashcards

1
Q

Segment of the ElectroMagnetic Spectrum that the human eye can view

A

Visible light spectrum

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2
Q

Lies between the UV and Infrared Radiation

A

Visible light spectrum

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3
Q

Travels through a prism

A

Visible light spectrum

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4
Q

Which color has the longest wavelenth?

A

Red

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5
Q

Which color has the shortest wavelenth?

A

Violet

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6
Q

Red wavelength

A

620-750nm

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7
Q

Orange wavelength

A

590-620nm

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8
Q

Yellow wavelength

A

570-590nm

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9
Q

Green wavelength

A

495-570nm

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10
Q

Blue wavelength

A

450-495nm

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11
Q

Violet wavelength

A

380-450nm

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12
Q

Discovered Visible light

A

Lawrence Isaac Newton

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13
Q

How was Visible light discovered?

A

Newton took a glass prism and held it up to a beam of sunlight streaming through a window.

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14
Q

Where visible light was discovered

A

Cambridge University of England (1665)

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15
Q

As light passes through a ______ it is bent/refracted.

A

Prism

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16
Q

How do prisms work?

A

As light passes through a prism, it is bent/refracted

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17
Q

Dominant source for light waves our eyes recieve

A

Sun

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18
Q

Produces white light (formed by the core)

A

Sun

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19
Q

The yellow tint we see as the sun is because?

A

The other colors are absorbed by clouds in the atmosphere

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20
Q

Sun surface temperature

A

5,500°C

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21
Q

Produces the white light of the sun

A

The core

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22
Q

Outermost layer of the suns atmosphere

A

Corona

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23
Q

Can be seen in visible light, but usually only on total eclipses

A

Corona

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24
Q

Tapered patterns that are formed around the sun by the outward flow of the plasma that is shaped by magnetic field lines

A

Coronal Streamers

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25
Q

Provides important scientific clues that reveal hidden properties/elements

A

Absorption lines

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26
Q

Acts like fingerprints for atoms and molecules

A

Absorption lines

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27
Q

Close examination of the visible-light spectrum from our Sun and other stars reveal a pattern of dark lines

A

Absorption lines

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28
Q

Absorption lines occur when______

A

An electron jumps from a lower energy state to a; higher energy state –> Produces photons –> Light particles

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29
Q

What are light particles called?

A

Photons

30
Q

Spectral Signatures

A

Graph of an objects reflectance across a spectrum

31
Q

Obtains information about the spectral response of ground materials and land vegetation phenology, as reference for satellite measurements

A

Spectral signatures

32
Q

Helps scientists determine the composition of the planets and other stars by identifying the specific wavelenths of light that they emit or absorb

A

Spectral signatures

33
Q

The light that is emitted or absorbed by a planet or star can be separated into its various colors, which form a _____

A

Spectrum

34
Q

Example of active remote sensing using visible light

A

Laser Altimetry

35
Q

A device used aboard planet-orbitting satellites to map a planet’s terrain

A

Laser Altimetry

36
Q

The elevations of surface features can be calculated by comparing how long it takes a laser pulse to echo back at different locations

A

Laser Altimetry

37
Q

Spectroscopic techniques

A

Employ light to interact with matter and thus probe certain features of a sample to learn about its consistency or structure

38
Q

Uses visible light to produce a spectrum or absorption lines

A

Spectroscopic Techniques

39
Q

Different elements have different ____?

A

Spectra

40
Q

When light passes through an atom, the atom can _______

A

Absorb certain colors and wavelenth

41
Q

Doppler red-shift of light

A

Observed from distant stars and galaxies

42
Q

When did Edwin Hubble measure the redshift and ground and found that the redahift of a galazy depends on its distance from Earth

A

1929

43
Q

Measured the redshift

A

Edwin Hubble

44
Q

What ore did Uranium, Polodium, and Radium come from?

A

Pitchblende

45
Q

Marie found that the ore was ___ more radioactive than Uranium.

A

4x

46
Q

Marie Curie broke the ore down and found ______ which had varrying radio activity.

A

Radium and Polonium

47
Q

Produces electrical charges produced by the radioactive sample begits to move the small light along the ruler

A

The Curie’s Electrometer

48
Q

Crystal used in Curie’s electrometer which emits an electric charge

A

Piezoelectric quartz

49
Q

Marie Curie also used _____ to obtain the absorption lines of the newly found elements.

A

Spectroscopic techniques

50
Q

What proved that Marie had really found two new elements?

A

Absorption lines

51
Q

GLAS

A

( Geoscience Laser Altimeter System) NASA instrument

52
Q

Onboard the Ice, Cloud, and land Elevation Satellite (ICE Sat)

A

Geoscience Laser Altimeter System

53
Q

Enables scientists to calculate the elevation of Earth’s polar ice sheets

A

Geoscience Laser Altimeter System

54
Q

Uses Laser and Ancillary data

A

Geoscience Laser Altimeter System

55
Q

Can make unique measurements of the heights and characteristics of clouds

A

Geoscience Laser Altimeter System

56
Q

Could end the need for travellers to switch to flight mode, Intrinsically safe

A

Visible light communication

57
Q

What does LiFi stand for?

A

Light Fidelity

58
Q

Can use existing power lines as LED Lighting so no new needed infrastructure is needed unlike with where you need to install new lines

A

LiFi

59
Q

Range of wavelengths of visible light

A

380-700 nm

60
Q

Nanometer

A

Metric unit of one billionth of a meter

61
Q

Why is visible light important?

A

The human eye and brain work together to convert visible light energy into an electrical impulse that can be interpreted as an image.

62
Q

Our eyes can detect electromagnetic radiation in the form of ________.

A

Visible light

63
Q

The reason we can see things around us is because they ______.

A

Either emit, reflect, or absorb visible light.

64
Q

Dispersion

A

The seperation of light into colors by refraction or diffraction with formation of a spectrum

65
Q

Frequency of Red

A

400-484 THz

66
Q

Frequency of Violet

A

668-789 THz

67
Q

Why are some colors not in the visible light spectrum?

A

Because they can only be made from a mix of multiple wavelengths.

68
Q

Colors containing only one wavelength are called ________.

A

Pure Colors or Spectral Colors

69
Q

In the past, visible light resulted in industry-revolutionizing discoveries like _____________.

A

Light bulbs and fiber optics

70
Q

Currently, visible light is necessary for medical imaging technologies such as ________.

A

CT, MRI, and X-rays for diagnosis.

71
Q

How is visible light crucial in photosynthesis?

A

It utilizes pigments such as chlorophyll to absorb specific wavelengths of light.

72
Q

The sky appears blue due to _______.

A

Rayleigh scattering

Electromagnetic Spectrum (7 decks)

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