Physics - Red-shirt 0.0 / 5 ? PhysicsRed-shiftIGCSEAQA Created by: becky.65Created on: 30-03-16 09:06 What is the Doppler effect? The change in the observed wavelength and frequency of the waves from a moving source due to the motion of the source relative to the observer 1 of 10 What happens when the source moves away from the observer? The observed wavelength increases and the frequency decreases 2 of 10 What happens when the source moves towards the observer? The observed wavelength decreases and the frequency increases 3 of 10 What is the red-shift of a distant galaxy? The shift to longer wavelengths of light from a galaxy moving away from us 4 of 10 How are we able to see red-shift effects? By observing dark lines in the spectra from distant galaxies. These dark lines are due to absorption of light in the source 5 of 10 What does a greater red-shift mean? That the galaxy is further away from us and the galaxy is moving away from us faster 6 of 10 Why is the universe expanding? Because all distant galaxies are moving away from each other 7 of 10 What does red-shift give us evidence for? The Big Bang theory 8 of 10 What is the Big Bang theory? That the universe started with a massive explosion at a very small point 9 of 10 What is cosmic microwave background radiation? Radiation that was produced by the Big Bang 10 of 10
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