Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is...
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Transcript of Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is...
![Page 2: Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is always 299792458 m/s or 300000000m/s Predict Highest.](https://reader036.fdocuments.us/reader036/viewer/2022062317/5a4d1ae27f8b9ab05997793e/html5/thumbnails/2.jpg)
![Page 3: Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is always 299792458 m/s or 300000000m/s Predict Highest.](https://reader036.fdocuments.us/reader036/viewer/2022062317/5a4d1ae27f8b9ab05997793e/html5/thumbnails/3.jpg)
Wavelength vs FrequencyC=L (speed = wavelength x frequency)• Speed of light is always
299792458 m/s or 300000000m/s• Predict Highest to lowest frequency
between wavelengths of 100m, .01m, .000001m
Freq Rank from Highest Lowest
Prediction 100m?-> .01m?-> .000001m?
Test Result(Do the calc)
.000001m (3x1015 Hz)
.01m(3x1011 Hz)
100m (3x107 Hz)
Conclusion As wavelength increases frequency….
![Page 4: Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is always 299792458 m/s or 300000000m/s Predict Highest.](https://reader036.fdocuments.us/reader036/viewer/2022062317/5a4d1ae27f8b9ab05997793e/html5/thumbnails/4.jpg)
Electromagnetic Radiation (EMR)
• Travels:– As waves– through empty space and substances
![Page 5: Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is always 299792458 m/s or 300000000m/s Predict Highest.](https://reader036.fdocuments.us/reader036/viewer/2022062317/5a4d1ae27f8b9ab05997793e/html5/thumbnails/5.jpg)
EMR Spectrum• How EMR is organized
– WAVELENGTH• Longest to shortest across the spectrum
– X-ray, Yellow visible light, purple vis. Light, Radio waves, UV, Gamma Ray, Microwaves, Infrared
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Visible Light Telescopes
• 2 types– Refracting telescope
• Convex lenses focus light
• Galileo– Oldest, simplest
– Reflecting telescope• Curved mirror reflects
image • Like Mr. Vargas’s
– Originally designed by Sir Isaac Newton
![Page 8: Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is always 299792458 m/s or 300000000m/s Predict Highest.](https://reader036.fdocuments.us/reader036/viewer/2022062317/5a4d1ae27f8b9ab05997793e/html5/thumbnails/8.jpg)
Gallileio vs. Newton
• Sketches include– Images and eyeballs– Outer case– Mirrors and lenses– Arrows indicating
the light’s path
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Radio Telescopes• Curved surface _____ radio waves to
focus them at a pointOther types•Infra red – used to recently find dense clouds in the milky way, UV and X ray
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Observatories and Light pollution• Why are observatories high on mountain
tops?• Observatories: buildings with one or more
telescopes– On top of mountains to reduce:
• Light pollution• Avoid some atmosphere
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Where would be the best possible place to have a telescope?
• Satellite telescopes are much better because:– No atmosphere, no light pollution– Satellite images are sleven times clearer than
anything from Earth
![Page 12: Waves and Light. Wavelength vs Frequency C=L (speed = wavelength x frequency) Speed of light is always 299792458 m/s or 300000000m/s Predict Highest.](https://reader036.fdocuments.us/reader036/viewer/2022062317/5a4d1ae27f8b9ab05997793e/html5/thumbnails/12.jpg)
Spectrographs• Most large telescopes have one hooked up to it.• Breaks light from object into spectrum• Spectrum tells us:
– Chemical composition– Temperature
Spectrograph
Temperature
ChemicalComposition
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Spectrographs (cont.)
• Two types:– Absorption lines: black lines on spectrum– Emission lines: lines of color on spectrum
• Lines = Chemical Fingerprint
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•These two spectrums are from the same chemical under different conditions.
Hot = EmissionCold = Absorption
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To remember…
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