Stellar Spectra

Light is the manifestation of pure __________.

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Light travels at a ____________ speed in a vacuum.

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When light passes through a prism, the wavelengths of light separate into a rainbow (spectrum) because of slight differences in speed.

• True

• False

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Energy seems to change because two or more _________ energy photons can be emitted in place of the higher energy photon that is absorbed.

• lower

• higher

• same

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This process of going from a fewer number of high energy photons to a larger number of lower energy photons is called _____________________.

• thermalization

• carmelization

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What information can the light from stars tell us once it has passed through a spectroscope?

• Chemical Composition

• Relative Velocity

• Density/Surface Gravity

• Rotation Speed

• Temperature

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The photosphere is defined as the layer we "_____" - where most of the photons in the photosphere escape and finally begin their journey through space.

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If a passing photon has an energy that is ____________ equal to the energy difference between any two orbital shells, there is some statistical probability that the atom will absorb the photon, pushing the electron to a higher energy state.

• approximately

• exactly

• nearly

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Photons with enough energy may completely remove an electron, _____________ the atom.

• neutralizing

• electrifying

• ionizing

• pacifying

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Energetically, the process of absorbing a photon is similar to the action of

• tossing a ball into the air.

• stretching a rubber band.

• lighting a fire.

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