Estimate light, eletron, neutron beams energy

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Homework Statement


estimate light, eletron, neutron beams energy to use 'order - of - magnitude'
[eV]

Homework Equations


E = hv

The Attempt at a Solution


E = hv where h is plancks constant and v is frequency and E is energy
6573 angstroms = 6.573 e-7 m = wavelength (λ)

First we must use: v = c/λ where c is the speed of light
v = (3.00 e8 m/s)/(6.573 e-7 m) = 4.564e14/s

E = (6.63 e-34 J x s)(4.564 e14/s) = 3.026 e-19 J





I dont know how can i solve it
how can i calculate el, neu?
 

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