Answer
a. 0.155 nm.
b. $8.44\times10^{-14}m$
Work Step by Step
$\lambda=\frac{h}{p}=\frac{h}{mv}$
a. $\lambda=\frac{6.626\times10^{-34}J \cdot s}{(9.11\times10^{-31}kg)(4.70\times 10^{6}m/s)}= 1.55\times10^{-10}m $
b. $\lambda=\frac{6.626\times10^{-34}J \cdot s}{(1.67\times10^{-27}kg)(4.70\times 10^{6}m/s)}= 8.44\times10^{-14}m $
