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    (Original post by Mango Milkshake)
    Anyone have notes they could upload?
    An A5 book half-full😭


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    Can someone make a Turning Points thread? I can't do it on my phone


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    For thermionic emission, does increasing the temperature of the metal filament increase the kinetic energy of the emitted electrons (as well as increasing the number of electrons emitted/sec)?
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    (Original post by Nikhilm)
    For thermionic emission, does increasing the temperature of the metal filament increase the kinetic energy of the emitted electrons (as well as increasing the number of electrons emitted/sec)?
    Just the number of electrons emitted per second. Increasing p.d. increases the kinetic energy and speed of electrons


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    (Original post by Yo12345)
    Just the number of electrons emitted per second. Increasing p.d. increases the kinetic energy and speed of electrons


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    Yeah that's anode pd once the electrons have been emitted, I'm talking about the pd across the supply used to produce a current to heat the metal filament to cause thermionic emission in the first place. The assumption is that they have 0 KE at the filament (Cathode) which is kinda dumb because a really high pd across the power supply would give these electrons a significant KE
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    (Original post by Nikhilm)
    Yeah that's anode pd once the electrons have been emitted, I'm talking about the pd across the supply used to produce a current to heat the metal filament to cause thermionic emission in the first place. The assumption is that they have 0 KE at the filament (Cathode) which is kinda dumb because a really high pd across the power supply would give these electrons a significant KE
    I don't think they ask about p.d. across the cathode, just the effect of current?


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    Anyone doing Applied 5C?
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    Edit: My bad it is on the specification -_-.
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    (Original post by Mango Milkshake)
    Anyone doing Applied 5C?
    Me
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    Do we always include neutrons in fission reactions when they ask us to find energy released?


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    (Original post by Yo12345)
    Do we always include neutrons in fission reactions when they ask us to find energy released?


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    Post link if you find an example where they don't, can't really imagine what situation would justify that
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    (Original post by MintyMilk)
    Post link if you find an example where they don't, can't really imagine what situation would justify that
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    Must be because they're thermal (slow) neutrons so they have negligible energy to contribute? Are there any examples where they do expect you to add the neutrons?
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    Created a new thread for anyone to discuss astrophysics

    http://www.thestudentroom.co.uk/show....php?t=4182393
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    Deriving the pressure of an ideal gas; worth memorising or no?
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    (Original post by MintyMilk)
    Must be because they're thermal (slow) neutrons so they have negligible energy to contribute? Are there any examples where they do expect you to add the neutrons?
    Yeah pretty much every other question about it ever


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    You do have to include neutron binding energy, but in this case there is 1 neutron going in and 1 neutron coming out, so they cancel out
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    (Original post by cjlh)
    Deriving the pressure of an ideal gas; worth memorising or no?
    Knowing how to derive it is in the spec, although I can't recall seeing a question on it before. You definitely have to know at least 4 assumptions made for the derivation
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    Can someone help with 7bii:
    https://e4cf8bb391554b7c9d8e0fc42269...ioactivity.pdf
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    (Original post by mcride98)
    You do have to include neutron binding energy, but in this case there is 1 neutron going in and 1 neutron coming out, so they cancel out
    There are 2 neutrons coming out...
 
 
 
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