The separation between the two slits is $0\mathrm{.}018$ mm $,1$m$=106$m$1$m$=106$m $,$ and the second$-$order minimum $($equivalent to dark fringe formed by light$)$ is formed at a angle of $19\mathrm{.}47$ relative to the incident electron beam.

Part A $-$ Find the wavelength of the moving electrons

The unit is nm$,1$ nm $=10-9$ m$.$ Keep $1$ digit after the decimal point.

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$=$

nothing

nmnm

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Part B $-$ Find the momentum of each moving electron.

Use scientific notations, format $1\mathrm{.}234*10$n$.$

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p $=$

nothing

kg$$m$/$skg$$m$/$s

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Part C $-$ Find the kinetic energy of each moving electron, using the classical physics formula KE $=(1/2)$mv$2.$ The mass of an electron is $9\mathrm{.}111031$ kgkg $.$

Use scientific notations, format $1\mathrm{.}234*10$n$,$ unit is Joules