Science: 24.1 The Study of Light – Flashcards
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Why is it important to study light?
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Almost everything we know about our universe beyond earth comes from analysing light
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what is electromagnetic radiation?
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The arrangement of electromagnetic waves according to their wavelengths and frequencies
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The 7 types of energy that make up the electromagnetic spectrum are:
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gamma rays, x-rays, ultraviolet light, visible light, infrared radiation, micro waves, and radio waves
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what does light behave as?
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Light sometimes behaves as like waves and at other times like particles
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How can you show that visible light is made up of many different wavelengths?
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seeing light pass through a prism
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Photons are:
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particles of light
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How are frequency and wavelength related?
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High frequency = short wavelength Low frequency = long wavelength
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what waves have the highest frequency?
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gamma rays
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absorption spectrum:
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a band of color with a series of dark lines running through it
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continuous spectrum:
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uninterrupted band of color
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emission spectrum:
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series of bright lines in particular wavelengths
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What can a star's spectrum tell about the star?
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it's elements, and thus the chemical makeup
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Doppler Effect:
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An observed change in the frequency of a wave when the source or observer is moving
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when light source and sound moves AWAY from an observer:
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Light becomes redder, and pitch becomes lower
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when light source and sound moves TOWARD an observer
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Light becomes bluer, and pitch becomes higher
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how is the doppler effect used in astronomy?
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used to determine whether a star or other body in space is moving away from, or toward earth
