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Calculate velocity of a 1MeV Neutron 
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#1
Aug2614, 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 


#2
Aug2614, 05:40 PM

Mentor
P: 11,864

1 MeV here is surely the kinetic energy, not the total (rest plus kinetic) energy.



#3
Aug2614, 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?



#4
Aug2614, 08:51 PM

Sci Advisor
P: 2,951

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. 


#5
Aug2714, 03:57 PM

Sci Advisor
P: 6,106

Since the neutron rest mass is approximately 940 Mev, you probably could use E=(mv^2)/2 to get v. (v=c/22?).



#6
Aug2714, 05:03 PM

Mentor
P: 12,053




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