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Week 4: "What is Light?"

31 flashcardsby grenier-m
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1
What is an electro-magnetic wave that moves through empty space? c = 300,000 km/s
  • Light
  • Sound
  • Radio Waves
  • Spectra
2
Light slows down in a more "____ ____".
  • Dense Medium
  • Airy Medium
  • Spectra Medium
  • Wavy Medium
3
What effect shows that light has a partical nature?
  • Photon-Electronic
  • Photo-Electric
  • Doppler
  • Electro-Magnetic
4
What can be made to cancel itself out, this shows that it has a wave nature.
  • Sound
  • Light
  • Electro-Magnetic
  • Energy
5
What means big waves or more photons?
  • Low Light
  • Blue Light
  • Bright Light
  • Red Light
6
What means very frequent waves or very energetic photons?
  • Bright Light
  • Red Light
  • Blue Light
  • White-Light
7
The following are part of the electro-magnetic spectrum on decreasing wavelength:
  • Radio, x-rays, gamma rays, infra-red, ultra-violet, matter.
  • Infra-Red, gamma rays, radio, ultra-violet, matter, x-rays.
  • Infra-Red, radio, ultra-violet, x-rays, matter, gamma rays.
  • Radio, infra-red, ultra-violet, gamma rays, x-rays, matter.
8
The direction light appears to be coming from can be changed by:
  • Sound, electro-magnetic fields, and refraction of light.
  • Starlight, electro-magnetic fields, and black holes.
  • Black holes, sound, electro-magnetic fields.
  • Starlight, gravity, and refraction of light.
9
What falls off as one over the distance square? (If you are 10x farther away from the source, then the light is 10^2 = 100x fainter.) It also is known as what law?
  • Light/Inverse Square Law
  • Sound/Inverse Square Law
  • Light/Wein's Law
  • Sound/Wein's Law
10
Light can be polarized which means:
  • Gravity bends and pulls the light as it approaches you.
  • It's electric field is vibrating in only onw direction as it approaches you.
  • Protons can energize and make the light grow brighter.
  • It can be continous spectra is produced by heating and ionizing the energy.
11
What contain protons in a central nucleus and electrons held close to the protons by the electro-magnetic force.
  • Light
  • Neutron
  • Atoms
  • Spectra
12
What don't fall into the nucleus because of the Pauli-exclusion principle? This also causes atoms to take up space around them.
  • Neutrons
  • Atoms
  • Light
  • Electrons
13
What comes in lumps (quanta) around the nucleus of an atom?
  • Energy
  • Light
  • Atoms
  • Sound
14
What can be broken into component colours using a prism giving us the classic set of colours?
  • Blue Light
  • White Light
  • Bright Light
  • Red Light
15
What is affected the least by a prism?
  • White Light
  • Blue Light
  • Red Light
  • Bright Light
16
What is affected the most by a prism?
  • White Light
  • Bright Light
  • Red Light
  • Blue Light
17
An atom in what state has all its electrons as close to the nucleus as possible.
  • Energized State
  • Electric State
  • Ground State
  • Resting State
18
Every atom has its own set of specific unique allowed:
  • Electrons
  • Orbits
  • Protons
  • Photons
19
What moving up in orbit can create an absorption spectra.
  • Electrons
  • Photons
  • Atoms
  • Energy
20
What are emitted by electrons falling from high energy orbits to low orbits?
  • Neutrons
  • Photons
  • Atoms
  • Energy
21
A what is composed of several bright lines surround by darkness?
  • Low Density Cold Gas
  • Dark Line Spectra
  • Bright Line Spectra
  • A Continous Spectra
22
A what is prodcued by white light traveling through a low density, cold, transparent gas?
  • A Bright Line Spectra
  • A Continous Spectra
  • A Dark Line Spectra
  • An Absorption Spectra
23
A what is produced by heating and ionizing a gas or by packing atoms very closely together?
  • Continous Spectra
  • Dark Line Spectra
  • Bright Line Spectra
  • Absorption Spectra
24
Every what has its own characteristic spectrum?
  • Atoms
  • Ions
  • Stars
  • Spectras
25
What in the ground state don't produce light?
  • Stars
  • Electrons
  • Atoms
  • Photons
26
Hot, ionized hydrogen gas produces what and not what?
  • Spectra Light/Dark Lines
  • Dark Lines/Spectra Light
  • Bright Lines/White Light
  • White Light/Bright Lines
27
A low density cold gas can produce a what spectra when a what is shone through it?
  • Dark Line/White Light
  • White Light/Dark Line
  • White Light/Bright Lines
  • Bright Lines/White Light
28
The Sun has a what spectrum showing it is a hot ball of what surrounded by a cooler, invisible gas?
  • Ionized Gas/Dark Line
  • Dark Line/Ionized Gas
  • Continous/Hydrogen Gas
  • Hydrogen Gas/Continous
29
If light from a star shows the 4 characteristic lines of what, then that star must contain that element.
  • Hydrogen
  • Atoms
  • Helium
  • Spectra
30
If light from a star doesn't show any hydrogen lines, it "_____" contain(s) hydrogen.
  • Still
  • Doesn't
31
If a light from a star doesn't show any hydrogen lines, it means the hydrogen is ionized which means it can't produce:
  • Bright Line Spectra
  • Continuous Spectra
  • Absorption Spectra
  • Line Spectra
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