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Calculat the wavelength

Calculate the wavelength associated with a neutron having a mass of 1.675 * 10^-24 g and a kinetic energy of 6.21 * 10^-21 J.

Find the speed of the neutron using:

$E_k = \frac12 mv^2$

Then use the equation of Max Planck:

$E = \frac{hv}{\lambda}$

to get the value of lambda, the wavelength.

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