As we look at objects further from earth, is the pattern shifted? Is it a red shift or a blue shift? Red shift, so the faraway galaxies, are going away from us. So -Ĭlose Star Nearby Galaxy Faraway Galaxy Really Faraway Galaxy The pattern of black lines come from hydrogen. The pattern is red shifted since it is shifted towards the red side of the spectrum.ġ6 What We See The pattern is red shifted. Is the pattern red shifted or blue shifted?ġ5 What We See The pattern is red shiftedĬlose Star Nearby Galaxy Faraway Galaxy Really Faraway Galaxy The pattern of black lines come from hydrogen. What We See Close Star Nearby Galaxy Faraway Galaxy Really Faraway Galaxy The pattern of black lines come from hydrogen. If the nearby galaxy wasn’t moving, the absorption spectrum (the pattern of black lines) would be in the same place.ġ4 Is the pattern red shifted or blue shifted? As we look at objects further from earth, is the pattern shifted? Is it a red shift or a blue shift? Red shift, so the faraway galaxies, are going away from us.ġ3 What We See Close Star Nearby Galaxy Faraway Galaxy Really Faraway Galaxy The pattern of black lines come from hydrogen. The pattern of black lines come from hydrogen. Light from hydrogen leaves a distinctive pattern of black lines (an absorption spectrum).ġ2 What We See Close Star Nearby Galaxy Faraway Galaxy Really Faraway Galaxy This is the absorption spectrum (pattern of black lines) from a close star like our sun. The sun and the stars are all made out of hydrogen. What colors will you see? red ? blueġ0 You Would See Green Yellow Blue Green Red Infrared*ġ1 The Sun & The Stars The sun is a star. A green light bulb grows out of their head. Green ? The person is holding a red and a blue light bulb. A green light bulb grows out of their head.ĩ Draw What You’ll See: Label the colors of the light bulbs! The person is holding a red and a blue light bulb. Wave source approaching (blue shift) wave fronts are squished together wavelength is shorter, frequency is higher so it appears bluer Wave source moving away (red shift) wave fronts are spread apart wavelength is longer, frequency is lower so it appears redder Q: What happens to the light the left eye sees? Red Shift Blue Shift No Shift Q: What happens to the light the right eye see? Red Shift Blue Shift No ShiftĨ A Person Stands on a Planet The Planet is Flying Away The left eye will see longer wavelength light and the right eye will see shorter wavelength light. Both eyes observe the same wavelength, yellow, light.ĥ Moving Wave Sources L R Q: Does either eye (left or right) observe a different wavelength light? Q: Does either eye (left or right) observe a different wavelength light? A: Yes. L R Q: Does either eye (left or right) observe a different wavelength light? Q: Does either eye (left or right) observe a different wavelength light? A: No. In which direction does the wavelength increase? Increasing λ In which direction does the frequency increase? Increasing f Here we look at some java applets: 2D big bang 3D big bang Today we’re going to learn why. This equation relates the observed and emitted wavelengths and the velocityis positive or negative depending on the direction of the relative movement of the source.1 Red Shift/Blue Shift The Doppler Effect with LightĢ Scientists Say: The universe started like this: It is useful to define a quantity, called the red shift which characterizes the change in the observed and emitted wavelengths λ o b s λ o b s = ( 1 + c v ) λ e m i t The position of the lines itself explain that the galaxy is moving away. The image on the top shows the emission spectrum from a faraway galaxy. Hence, an increase in wavelength is named “redshift” and a decrease is called “blue shift”. In the visible range of electromagnetic spectrum, red light has the longest wavelength whereas blue has the shortest wavelength. For a decrease in wavelength, the change is called blue shift and for an increase of wavelength, the change is called red shift. The observed radiation may have a decreased or an increased wavelength with the original emitted radiation. When the radiation from a source reaches an observer (located at a different position at different time), the wavelength (also frequency) may change due to reasons like Doppler effect, gravitational field and the expansion of the universe.
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