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Thread: The Universe

  1. #101
    Anglophobiphile Brawny's Avatar
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    In the discussion of mathematics, it seems grammar has completely gone out the window.

    Write an equation for the number of times "your" has been used wrongly.

  2. #102
    I'm Good at Games Dorkfish's Avatar
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    Quote Originally Posted by crazyman2
    No way, h/(lamba) is the equation for the momentum of a photon. it could also be written as hf/c. And it is derived from einsteins E=mc^2. The only way to prove a photon has momentum is by einsteins energy/mass equivalency.

    Ok so p=mv, but photons don't have mass, but they do have energy. So we can use einsteins E=mc^2. Solve for mass: m=E/c^2. Substitute that into p=mv: p=(E/c^2)v. But the velocity of a photon is always c, so that cancels with 1 of the c's on the bottom creating : p=E/c. And, as i stated in the wrong place in an above post, E=hf. Substitute in for E: P=hf/c. And because v=(lambda)f and v=c then p=hf/(lambda)f. the f's cancel and you get p=h/(lambda)


    according to physics 30 of course =). they could easily have lied about that haha.


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  3. #103
    Senior Member Napalmbrain's Avatar
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    Quote Originally Posted by crazyman2
    No way, h/(lamba) is the equation for the momentum of a photon. it could also be written as hf/c. And it is derived from einsteins E=mc^2. The only way to prove a photon has momentum is by einsteins energy/mass equivalency.

    Ok so p=mv, but photons don't have mass, but they do have energy. So we can use einsteins E=mc^2. Solve for mass: m=E/c^2. Substitute that into p=mv: p=(E/c^2)v. But the velocity of a photon is always c, so that cancels with 1 of the c's on the bottom creating : p=E/c. And, as i stated in the wrong place in an above post, E=hf. Substitute in for E: P=hf/c. And because v=(lambda)f and v=c then p=hf/(lambda)f. the f's cancel and you get p=h/(lambda)


    according to physics 30 of course =). they could easily have lied about that haha.
    My mistake, I completely forgot about p=h/(lambda). It's the de Broglie equation, something I should have remembered.
    It's like all the more complicated physics and maths I've learned in the past two or three years is pushing the easier stuff out of my head.



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  4. #104
    WiiChat Member crazyman2's Avatar
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    Haha, ya not the most advanced stuff ever. pretty much as advanced as i've been in physics tho.
    Anyways, back on topic, i think the universe is really really big....... haha
    Last edited by crazyman2; 03-16-2008 at 08:10 PM.


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  5. #105
    Bringer of meaty goodness DBloke's Avatar
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    Mr Adams put the sie of the Universe in a simple way

    The univerese is big
    Very big
    You whoulndt belive how big it is
    I maen you think its far to the shops but thats just penuts to space
    Score another Hitch hikers ref


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