There were two elements to the reading last week on black holes that I wanted you to delve into. One is gravitational waves and the other is hawking radiation. lets start with gravitational waves - Gravitational waves are waves in
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Question 2
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What sort of thing would be stretched if a gravitational wave passed by
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Question 3
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watch this video about Gravitational waves and LIGO.
Do you have any questions?
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Question 4
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Review - what is absolute zero?
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Question 5
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I have mentioned before the three laws of thermodynamics
you can't win
you can't lose
you can't get out of the game
match these to what their laws actually state.
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you can't get out of the game
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you cannot get more energy out of a system than you put into it.
you can't win
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entropy always increases, some usuable energy is always lost as unusable energy
you can't break even
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you will never reach absolute zero
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Question 6
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Hawking radiation hinges on two things - Black holes can't be absolute 0, because nothing can be, and Entropy is always increasing. But the theoretical temperature of a black hole is insanely low. The temperature of outer space is a balmy 2.7 kelvins. We believe the temperature of a _small_ black hole to be as high as 6 x10^-8 K . Just to drive that point home, write that number out in standard units.
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Question 7
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watch this video for a more in depth explanation of the above.
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Question 8
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we will be talking about these two concepts as well as what you are listening to in your podcast this weekend. We will have a session test week 9, and just review formatives for that next weekend. But there will be a lot about relativity coming up, and we did have a minute physics about general relativity last week, so to prep you for what is coming, I thought I would start you with the introduction to the series of videos you will be watching after the test.