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lecture04 - Astronomy Picture of the Day Sputnik 1 the...

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Astronomy Picture of the Day Sputnik 1 - the first artificial satellite to orbit the Earth
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Turn in the homework in the P20A drop box Remember to show your work on mathematical questions Don’t forget the units! Homework grading: (2 points per question) × (5 questions) Homework
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Wavelength Energy Emission lines Emission lines from gas clouds A dilute (non-opaque) gas cloud is not a black-body emitter Atoms in a hot, dilute cloud of ionized gas will emit a characteristic pattern of spectral lines This is called an emission-line spectrum
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Wavelength Energy Absorption lines Absorption-line spectra If there is a cloud of atoms in between a black-body emitter and you, you’ll see absorption lines where some photons are “missing” from the black-body spectrum
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Wavelength Energy Absorption-line spectra Normal stars like the sun have absorption-line spectra Black-body radiation originates deep within the star It passes through cooler, less dense layers of gas on its way out
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The spectrum of a star
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The spectrum of a star
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Doppler effect demo: http://www.astro.ubc.ca/~scharein/a311/Sim/doppler/Doppler.html
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The Doppler Effect Stationary source of waves
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The Doppler Effect Person over here hears a lower pitch Person over here hears a higher pitch Moving source of waves
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Doppler Effect: Summary If the source of waves is moving toward you, you’ll see waves of shorter wavelength For light waves, this is called a blueshift If the source of waves is moving away from you, you’ll see waves of longer wavelength
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