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Sci 9- Space Unit Topic 3
Transcript of Sci 9- Space Unit Topic 3
EXPLORATION Science 9 Topic 3 -
New Meanings In Light youtube- Astronomy - spectroscopy - 1/3 10 mins youtube- Astronomy - spectroscopy - 2/3 10 mins youtube- Astronomy - spectroscopy - 3/3 10 mins Spectral Lines Isaac Newton passed a beam of light through a prism to produce a spectrum of colors. If you pass the light through a narrow slit before sending it through a prism the spectrum will be in more detail. Joseph von Fraunhofer used a spectroscope to observe the spectrum produced by the Sun. He noticed dark lines, called spectral lines, but didn’t know what they meant. He found these spectral lines throughout the solar system. Spectroscopy:
The Science of Colour Each particular element had its own unique spectral lines. This led to the science of spectroscopy –
the study of spectra, as a part of chemistry. diffraction grating look it up, write down the definition Spectroscopy for Astronomers Astronomers refract the light from distant stars to determine what the star is made of. Each element that is present in the star creates its own black-line ‘fingerprint’. Stars have dark bands in distinct sequences and thicknesses on their spectra. that cannot be identified remain as inferences, based on what astronomers know about certain types of stars. Because the distant stars are much dimmer than our Sun, only some of the elements in the spectra can be identified. By attaching spectroscopes to their telescopes, astronomers are able to observe a star’s spectra The Doppler Effect A change in the pitch (frequency) of sound waves because they are stretched or squeezed red = away
blue= to you The amount of shift indicates the speed at which the star is approaching or moving away. There are also practical applications that use the Doppler effect. Read p 376-377 Read page 380 On page 381- here's a fast-fun
activity on the fingerprints of Stars
Answer all 6 questions! Read p. 382-383 this video is loud!!! watch the video to answer a question