Week 4: "What is Light?"
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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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