Answer:
[tex]135 \mu m[/tex]
Explanation:
The distance traveled by electromagnetic radiation is given by:
[tex]d=vt[/tex]
where
v is the speed of the radiation
t is the time elapsed
Electromagnetic radiation travels at the speed of light, which is equal to:
[tex]v=c=3\cdot 10^8 m/s[/tex]
The time elapsed in this problem is
[tex]t=0.45 ps=0.45\cdot 10^{-12} s[/tex]
Substituting into the equation, we find
[tex]d=(3\cdot 10^8 m/s)(0.45\cdot 10^{-12} s)=1.35\cdot 10^{-4} m[/tex]
which corresponds to [tex]135 \mu m[/tex]
