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Jamie Reniva 1J
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Postby Jamie Reniva 1J » Mon Apr 23, 2018 9:10 am

How do we know when to use the DeBroglie equation? I'm still a little bit confused where to get "p" in the equation.

Isabelle De Rego 1A
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Re: DeBroglie

Postby Isabelle De Rego 1A » Mon Apr 23, 2018 12:39 pm

You only use De Broglie when you are finding the wavelength of something with a mass( wavelength = h/p) . p=mv, where m is mass and v is velocity. So, they would probably give you the two of the three variables and then you would solve for the third one.

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Re: DeBroglie

Postby 004985802 » Thu Apr 26, 2018 7:46 pm

you would use this to measure the wavelength of a moving object that has mass in order to determine whether it has wavelike properties

Nick Griffin 1K
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Re: DeBroglie

Postby Nick Griffin 1K » Thu Apr 26, 2018 8:01 pm

DeBroglie determines the wavelength/wavelike properties of things with mass. So you don't use it for light, just things with mass (and velocity since you need momentum which is mass x velocity). You would probably use it in a problem to find wavelength, mass, or velocity (h is a constant)

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Re: DeBroglie

Postby AnnaYan_1l » Thu Apr 26, 2018 8:15 pm

I agree with the people above! p (which means momentum) is = to (mass)(velocity) which is usually given to you in some shape or form in the question. It is for a moving object (not light)

Shimran Kumar 1C
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Re: DeBroglie

Postby Shimran Kumar 1C » Thu Apr 26, 2018 9:10 pm

Light does have a momentum. The photons however do not have a mass. So I suppose if the problem gave you a value for the momentum (p), you could use the de Broglie wavelength as normal. Otherwise, this equation doesn't work for light.

Endri Dis 1J
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Re: DeBroglie

Postby Endri Dis 1J » Thu Apr 26, 2018 10:39 pm

Can someone give an example of a practice problem that uses the DeBroglie Equation?

Nicole Shak 1L
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Re: DeBroglie

Postby Nicole Shak 1L » Thu Apr 26, 2018 11:32 pm

In class the example was to find the wavelength of a 0.1 kg baseball traveling at a velocity of 35 m/s. You would use the DeBroglie Equation, wavelength=h/m*v to solve this.

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