Answer
$\lambda=0.333mm$
Work Step by Step
As we know that
$v=f\lambda$
$\lambda=\frac{v}{f}$
We plug in the known values to obtain:
$\lambda=\frac{1500}{4.50\times 10^6}=3.33\times 10^{-4}=0.333\times 10^{-3}=0.333mm$
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