Lecture04 - Big Bang Black Holes No Math Dr Jonathan Asaadi...

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Big Bang, Black Holes, No Math Dr. Jonathan Asaadi Dr. Jonathan Asaadi Lecture 04 Lecture 04 Physics we need Physics we need Big Bang, Black Holes No Math Topic: Physics we need 1
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Big Bang, Black Holes No Math Topic: History 28 2 Reading Assignment Discussion (Please come to class ready to discuss) NEXT LECTURE What are Newton's three laws of motion? What did they have to do with the discussion of light? Can you explain the double slit experiment? Why does this demonstrate the wave nature of light? What is the problem with “turtles all the way down”? How do you think this relates to the course? What was Olber's Paradox?
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Big Bang, Black Holes No Math Topic: History of science 3 Group task Does light have a speed or is it instantaneous? How do you know this? (tell the story) Imagine an experiment (or tell me about one you know) that could tell the difference between light having a finite speed and light being instantaneous Treat this assignment as a “warm-up” for the writing style we will use in the first paper. Explain the story of why you think light is instantaneous or has a finite speed. Also clearly explain the experiment you have in mind and tell me why this demonstrates one hypothesis or the other.
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The story of the speed of light
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Speed of light Speed of sound Doesn't take too many experiences to convince you that sound isn't instantaneous “Why are they all clapping late?” But what about light Clearly really really really fast But how fast? Can a human measure it? Big Bang, Black Holes No Math Topic: History of science 5
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Speed of light The ancients thought that light was instantaneous They thought the eye produced light “Go outside at night, close your eyes, and then open them. Since I see the very distant stars it must mean that the light got to them instantly” - Hero of Alexandria Big Bang, Black Holes No Math Topic: History of science 6
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Big Bang, Black Holes No Math Topic: History of science 7 Speed of light Galileo disagreed Set-up an experiment to show this Made his assistant walk a mile away on a hilltop Galileo flashed his lamp and told his assistant to flash his lamp when he saw the light Then tried to measure the delay before he saw his assistant's lamp 1638 Speed of light is at least 10x Speed of light is at least 10x faster than sound” faster than sound”
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This experiment failed Just measured their reaction time This means light is REALLY fast Need really far distances! Big Bang, Black Holes No Math Topic: History of science 8 Speed of light Speed of light is at least Speed of light is at least 10x faster than sound” 10x faster than sound”
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Ole Roemer measures the time of an eclipse of Jupiter's moons!
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