Lecture03 - Light Fundamental tool in astronomy Light has...

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Light Fundamental tool in astronomy Light has wave-like properties in some aspects wavelength ( λ ): distance between peaks (m, Å, km) frequency (f): # waves per second (Hz) speed (c): distance wave travels per second (m/s) c = f λ for light, c = 3 x 10 8 m/s = 300,000 km/s Light is an electromagnetic wave
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The Electromagnetic Spectrum A very wide range of wavelengths : gamma rays 10 -16 m X rays 10 -12 m ultraviolet 10 -8 m visible 10 -7 m infrared 10 -5 m radio >1 m
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Spectra Most light sources emit energy over many different wavelengths Spectrum: distribution of intensity (energy, brightness) with wavelength Spectrograph: device that splits light into its colors and measures their intensities dispersion: breaking light into its colors disperser: prism or diffraction grating
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Stellar Brightness Photometry Measured in a defined color (wavelength) band Johnson standard broad-band system U ultraviolet B blue V visual (green-yellow) R red I infrared
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Lecture03 - Light Fundamental tool in astronomy Light has...

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