De Broglie Formula vs. Speed of Light Formula

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Meigan Wu 2E
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De Broglie Formula vs. Speed of Light Formula

Postby Meigan Wu 2E » Fri Nov 02, 2018 2:56 am

How do you know when to use the De Broglie formula versus the speed of light formula?

Gabriela Aguilar 4H
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Joined: Fri Sep 28, 2018 12:29 am

Re: De Broglie Formula vs. Speed of Light Formula

Postby Gabriela Aguilar 4H » Fri Nov 02, 2018 8:08 am

De Broglie is only used when the question explicitly says use the de Broglie equation to find whatever it is they are asking.

Meigan Wu 2E
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Re: De Broglie Formula vs. Speed of Light Formula

Postby Meigan Wu 2E » Fri Nov 02, 2018 10:22 am

In the case of Question 3C on Test 2, how do we know when to used the De Broglie equation then?

Lopez_Melissa-Dis4E
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Re: De Broglie Formula vs. Speed of Light Formula

Postby Lopez_Melissa-Dis4E » Fri Nov 02, 2018 11:26 am

De Broglie is used when the mass of some particle is involved. (mass of an electron, proton, neutron...etc) The speed of light formula refers to a photon.

melodyzaki2E
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Re: De Broglie Formula vs. Speed of Light Formula

Postby melodyzaki2E » Fri Nov 02, 2018 11:28 am

the speed of light formula is only used on wavelengths in the electromagnetic radiation spectrum, you can't use it when particle has mass (you have to use de broglie for that).

Meigan Wu 2E
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Re: De Broglie Formula vs. Speed of Light Formula

Postby Meigan Wu 2E » Fri Nov 02, 2018 1:55 pm

Thanks everyone! I realized that the question involves copper metal, which has resting mass, so we have to use the De Broglie Formula.


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