what is the de Broglie wavelength of a neutron moving at half of the speed of light ? ( the mass of a neutron is 1.67493x10^-27kg)
Speed of light is 3.0*10^8 m/s
so, we have:
v = (3.0*10^8 m/s)/2
= 1.5*10^8 m/s
mass, m = 1.67493*10^-27 Kg
use:
lambda = h / (m*v)
lambda = (6.626*10^-34) / (1.67493*10^-27*1.5*10^8)
lambda = 2.637*10^-15 m
Answer: 2.637*10^-15 m
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