Deriving the DeBrogile Equation


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305086803
Posts: 99
Joined: Wed Sep 18, 2019 12:16 am

Deriving the DeBrogile Equation

Postby 305086803 » Sat Oct 19, 2019 2:16 am

Hi Everyone,

I know that Dr. Lavelle goes super in-depth when deriving equations, such as the DeBrogile, and I'm assuming he does so that we can get a better understanding of what it does. I was wondering how important it was for us to 100% know how to derive the equation. Is it fine if we have the basic understanding of what it does?

Thanks

KeyaV1C
Posts: 103
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Re: Deriving the DeBrogile Equation

Postby KeyaV1C » Sat Oct 19, 2019 9:03 am

It’s probably a good idea to remember how to derive it especially since it’s a pretty short derivation. λ=h/p and p=mv so λ=h/mv

Ruby Tang 2J
Posts: 102
Joined: Fri Aug 30, 2019 12:15 am

Re: Deriving the DeBrogile Equation

Postby Ruby Tang 2J » Sat Oct 19, 2019 10:20 pm

It is probably fine that you have a basic understanding of what it does, but I guess the main takeaway in deriving the DeBroglie Equation is that you can combine E=pc and E=hv to get hc/λ = pc --> h/λ = p --> h/λ = mv --> λ = h/mv

Ruth Glauber 1C
Posts: 100
Joined: Wed Sep 18, 2019 12:20 am

Re: Deriving the DeBrogile Equation

Postby Ruth Glauber 1C » Sun Oct 20, 2019 10:30 pm

I think it's useful to know how to derive it!

Ian Morris 3C
Posts: 101
Joined: Wed Sep 18, 2019 12:18 am

Re: Deriving the DeBrogile Equation

Postby Ian Morris 3C » Sun Oct 20, 2019 10:40 pm

Usually it is useful to be able to derive a simpler equation like this, as the derivation can be helpful for a question of a test.

Petrina Kan 2I
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Joined: Fri Aug 30, 2019 12:17 am

Re: Deriving the DeBrogile Equation

Postby Petrina Kan 2I » Sun Oct 20, 2019 11:46 pm

While I think it's not totally necessary to memorize and know the derivation, it might prove to be helpful since the equations used to derive it are equations that we should know and memorize anyways! This way we can have a greater knowledge of how these concepts work together which could hopefully help on a test. :)

Sean1F
Posts: 19
Joined: Sat Sep 07, 2019 12:16 am

Re: Deriving the DeBrogile Equation

Postby Sean1F » Sun Oct 20, 2019 11:55 pm

Petrina Kan 3C wrote:While I think it's not totally necessary to memorize and know the derivation, it might prove to be helpful since the equations used to derive it are equations that we should know and memorize anyways! This way we can have a greater knowledge of how these concepts work together which could hopefully help on a test. :)

I agree! What's important is that you know the equations and how to use them. I find it similar to calculus where you need to know equations and methods of finding answers but not really where they come from.

DMuth_1J
Posts: 63
Joined: Thu Jul 11, 2019 12:15 am

Re: Deriving the DeBrogile Equation

Postby DMuth_1J » Tue Oct 22, 2019 11:21 am

It would also be helpful to know how to derive the equation because you can use the base equations as opposed to the complete, derived one.

Lauren Lewis3L
Posts: 57
Joined: Wed Feb 20, 2019 12:16 am

Re: Deriving the DeBrogile Equation

Postby Lauren Lewis3L » Mon Oct 28, 2019 11:12 pm

Are we going to get the Planck's constant number or do we have to memorize it?


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