The kinetic energy of an electron that has a wavelength of $$10\ \mathrm{nm}$$ is

A

$$2.4 \times10^{-21}\ \mathrm J$$

B

$$4.8 \times10^{-21}\ \mathrm J$$

C

$$2.4 \times10^{-29}\ \mathrm J$$

D

$$4.8 \times10^{-29}\ \mathrm J$$