Drawing A Red Shift

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Drawing ARed Shift

• Day 3

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Bellringer

• True or False
• Most of the electromagnetic spectrum consists of
  visible light.
• Explain your answer

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Types of Spectra
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Continuous Spectra
Above is a typical continuous spectrum. It is
actually made up of individual linesf or each
distinct wavelength, but the lines are so close
together that they blend into one continuous
spectrum. A good example of a continuous
spectrum is a rainbow.
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Emission Spectra
This is a typical emission spectrum. The lines
represent distinct wavelengths of light that are
strongly emitted by this object. These lines can
be used to determine lots of information about
the objectlike what it is made of, how far away
it is, or its temperature.
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Absorption Spectra
This is a typical absorption spectrum. Notice,
it looks like a continuous spectrum, but it has
holes in it. These are called absorption lines
and they are places where the continuous spectrum
that was emitted has been absorbed by something.
It could be something around the object absorbing
this energy or it could be something between us
and the object doing it. Either way, the
wavelengths of energy that are absorbed can give
us clues about the object or objects that are
absorbing this energy.
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Electromagnetic waves

• Need a medium to travel through
• Can travel through a vaccum

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So, what is a red shift?

• Red shifts and blue shifts are just the Doppler
  effect with electromagnetic radiation (light)
  instead of sound.

Weve all experienced this kind of situation.
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The Doppler effect is characteristic of

• Light waves
• Water waves
• Sound waves
• All of these
• None of these

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The Doppler effect occurs when the source of the
wave moves

• Away from you
• Toward you
• Both of these
• None of these

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Spectroscope Activity

• Working with your shoulder partner, we are going
  to look at a continuous, emission line, and
  absorption spectrum
• We are going to draw each of these and then draw
  these red shifted and blue shifted

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Writing Assignment

• Key Words Use each word at least once.
• Red shift
• Blue shift
• Spectrum or spectra
• Wavelength or wavelengths
• Light
• Doppler Shift
• Moving closer
• Moving away

• Bingo writing assignment

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Homework

• Red shifts and blue shifts
• Bring this back completed next time.
• Be sure to pay attention to the way the lines can
  change color when they shift.

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Ticket Out

• Using the spectrum below, draw it redshifted and
  blue shifted.