Calculate Energy of Neutron Wavelength 0.1nm

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To calculate the energy of a neutron with a wavelength of 0.1 nm, the equation E = hv/L is proposed, where L represents the wavelength. There is confusion about how to express velocity (v) in terms of energy (E), as total energy includes both kinetic and rest energy. The alternative approach suggests using the de Broglie wavelength formula, λ = h/p, to find kinetic energy (KE) and then adding the rest energy. Clarification is needed on whether to consider total energy or just kinetic energy for this calculation. The discussion emphasizes the importance of understanding the relationship between wavelength, momentum, and energy in particle physics.
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Homework Statement



Calculate the energy of a neutron wavelength 0.1nm


Homework Equations





The Attempt at a Solution



let L = lambda

So i just use E = hv/L

L = hv/E

But how do i write v in terms of E? isn't E the total energy rather than just kinetic...
 
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Or can i use lambda = h/p, work out the KE, then add on the rest energy?
 

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