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Calculate velocity of a 1MeV Neutron

by rem45
Tags: 1mev, neutron, velocity
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rem45
#1
Aug26-14, 05:35 PM
P: 13
How would one calculate the velocity of a 1MeV neutron??

I tried the following the attached formula for V/C but E is less than the rest mass which yields the square root of a negative number. Not sure what to do for this
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jtbell
#2
Aug26-14, 05:40 PM
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1 MeV here is surely the kinetic energy, not the total (rest plus kinetic) energy.
rem45
#3
Aug26-14, 05:43 PM
P: 13
It doesn't say. I guess that I will assume such. Is the 'E' in the equation I am using for the rest mass energy plus the kinetic energy?

Matterwave
#4
Aug26-14, 08:51 PM
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Calculate velocity of a 1MeV Neutron

Since a neutron has a higher rest mass than 1MeV, then one should safely assume that kinetic energy is what is meant here.

The E in that equation is indeed the rest+kinetic energy.
mathman
#5
Aug27-14, 03:57 PM
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Since the neutron rest mass is approximately 940 Mev, you probably could use E=(mv^2)/2 to get v. (v=c/22?).
mfb
#6
Aug27-14, 05:03 PM
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Quote Quote by mathman View Post
Since the neutron rest mass is approximately 940 Mev, you probably could use E=(mv^2)/2 to get v. (v=c/22?).
I agree that a nonrelativistic approach should be fine - it is a very good approximation.


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