Photons?  [ENDORSED]

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Emily Glaser 1F
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Postby Emily Glaser 1F » Thu Nov 09, 2017 12:40 pm

Is the DeBroglie Equation only applicable to non-photon objects? Are photons the fastest particle ever?

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Re: Photons?

Postby Chem_Mod » Thu Nov 09, 2017 12:58 pm

Yes and Yes

As discussed in my Wednesday review session the DeBroglie Equation applies to particles with rest/real mass that are moving.

You can also discuss this today (Thursday) in the many support hours I have organized:

Chemistry & Biochemistry, 4222 Young Hall
Victoria Ford 12-1 pm, Ronald Yang 12-1 pm, Karen Leung 1-2pm

STEM Learning Center, Boelter Science & Engineering Library 8251
Franklin Liu 2-4 pm

Five (physical) hours available today (Thursday), in addition to Chemistry Community.

Good luck with your midterm.

Kellina Tran 2I
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Re: Photons?

Postby Kellina Tran 2I » Thu Nov 09, 2017 1:55 pm

Yes, so if you are trying to find the wavelength of an ejected electron, you must use the De Brogile equation an its momentum. You cannot use E = hv and other extensions of it.

Mei Blundell_1J
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Re: Photons?

Postby Mei Blundell_1J » Fri Apr 20, 2018 7:12 pm

I'm unclear on why E=h/p can't be used for photons. After all, photons do have momentum p and E=h/p is derived from equations that describe photons, so why doesn't E=h/p also describe photons? Photons don't have mass but they do have momentum, so I don't see why E=h/p can't be used for photons. I'm pretty sure the answer has to do with E=mc^2, but I'm having trouble making the connection. Please help. Thanks

Sam Metzger 1C
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Re: Photons?  [ENDORSED]

Postby Sam Metzger 1C » Sat Apr 21, 2018 3:27 pm

Photons do not have a REST mass, which is another criteria for the equation to stand. Although a photon may have p, because they don't have a rest mass they do not apply to the De Broglie equation.

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