Momentum  [ENDORSED]

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Postby 304744081 » Sun Oct 22, 2017 10:13 pm

If you are given the velocity and you are asked to find the kinetic energy, is there a constant that is used for the mass in kilograms? Does it change depending whether its a photon, electron, etc...?

Carlos Gonzales 1H
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Re: Momentum  [ENDORSED]

Postby Carlos Gonzales 1H » Sun Oct 22, 2017 10:26 pm

I believe you would be given the mass also, typically the mass of a subatomic particle is given as kilograms in the DeBroglie equation

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Re: Momentum

Postby mendozayael_2H » Sun Oct 22, 2017 10:48 pm

The mass variable (m) will change according to what particle/object is given. I'd say typically the particle will be an electron, who's mass is 9.1093 x 10^(-31) kg, so you can use that. But the question should let you know what particle is being observed, and you would use that particle's mass for the m variable.

Beza Ayalew 1I
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Re: Momentum

Postby Beza Ayalew 1I » Tue Oct 24, 2017 4:52 pm

Yea, it would be good to know the mass of an electron just as common chem knowledge, but I'm pretty sure he gave the mass of a proton, neutron and an electron on the last exam so you should generally be able to find the mass on the actual exam.

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