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Astronomy: Exam 2 > Light > Flashcards

Light Flashcards

1
Q

Light can be characterized by its

A

energy, wavelength, or frequency

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2
Q

White light separates into

A

the ROYGBIV rainbow

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3
Q

Emission

A

give off light

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4
Q

Absorption

A

take in light

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5
Q

Transmission

A

light passes through

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6
Q

Transparent

A

objects transmit light.

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7
Q

Opaque

A

objects block (absorb) light.

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8
Q

Reflection/scattering

A

bouncing of light

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9
Q

Light travels as a

A

wave

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10
Q

Frequency

A

is how many waves pass by a particular point each second – measured in oscillations per second (Hertz = Hz)

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11
Q

Wavelength

A

is the distance between two wave peaks

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12
Q

All light travels at

A

The same speed

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13
Q

relationship between wavelength and frequency?

A

inverse
Longer wavelength = lower frequency
Shorter wavelength = Higher frequency

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14
Q

Ultraviolet light

A

Beyond Blue = Shorter wavelength, Higher E, Higher f

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15
Q

Infrared light

A

Beyond Red = Longer wavelength, Lower E, Lower f

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16
Q

The Electromagnetic Spectrum

A

Gamma rays, X-rays, Ultraviolet, Visible, Infrared, Microwaves, Radio

17
Q

Spectroscopy

A

analyzing light (intensity of light at each wavelength)

18
Q

Continuous

A

Solid material or opaque material radiate all colors of the rainbow

19
Q

Emission

A

A hot gas emits light at just certain frequenices/energies/wavelengths
“Bight Lines”

20
Q

Absorption

A

A cool gas in front of a dense material has a rainbow light spectrum with dark lines superimposed
“Black lines”

21
Q

Wien’s Radiation Law

A
  1. Intensity curves below show celestial objects emit light at all wavelengths
  2. Higher temperature objects emit more light at all wavelengths than cooler objects
  3. Peak intensity of higher temperature objects has a shorter wavelength than cooler objects
22
Q

Continuous spectrum

A

Solid material or opaque material radiate all colors of the rainbow

23
Q

Emission spectrum

A

A hot gas emits light at just certain frequencies/energies/wavelengths

24
Q

Absorption spectrum

A

A cool gas in front of a dense material has a rainbow light spectrum with dark lines superimposed

25
Q

Doppler shifting of light

A

Can tell how fast an object is moving towards us (Blueshift) or away from us (redshift)
Spectral lines are wider when an object rotates faster

26
Q

Redshift

A

Measured larger then Rest = Away

Rotating away from us

27
Q

Blueshift

A

Measured smaller than Rest = Toward

Rotating towards us

Astronomy: Exam 2 (4 decks)

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