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SNC1D Mr. Spacie /10 Lab Activity: Name: ______________ Stellar Spectra OBJECTIVE: To explore the methods by which astronomer determine the composition of stars. MATERIALS: Computer Pencil PROCEDURE: 1. Go to the following website: Stellar Spectra Activity 2. Read through the instructions and the example given. 3. Click ‘Go’ at the bottom of the page. 4. Examine each of the spectra given for the 4 elements carefully, then click ‘Go’. 5. Using the spectra given try to identify the mystery star at the bottom of the page. Click on the boxes for the elements you think are present then click ‘Did I get it Right?’ 6. If you got it right record the elements present in your observations table, then click on ‘Give me another star’ and try again. If you got it wrong click on ‘back to the same star’ and try again and then record your results. 7. Repeat for at least 4 different stars. DATA AND OBSERVATIONS: (4 STAR # MARKS, ½ MARK EACH) ELEMENTS PRESENT QUESTIONS: 1. Explain how spectroscopic analysis enables us to determine what elements are present in a star. (K: 2 marks) 2. Does the spectroscopic analysis of a star tell us the composition of the entire star or just a part of it? (HINT: Stars are opaque). (T: 1 mark) 3. Astronomers focus on distant stars through an optical telescope and pass the starlight through a diffraction grating SNC1D Mr. Spacie /10 Name: ______________ where it is split into its prismatic colours and projected on to a photographic plate. Yet, the photographic paper used is black and white rather than colour. Explain how this is still a very effective way of making accurate measurements and interpretations (i.e. even without colour). (A: 2 marks) 1. Consider the spectral patterns below (Hint: Left side of the spectrum is blue; right side is red): Hydrogen, H Helium, He Mercury, Hg Mystery Star X a) Using the spectral patterns above, which elements are in Mystery star X? (I: 1 mark)