Why can 10^6 , km not be represented as M , k | vedclass

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(D) In the $SI$ system,prefixes are used to indicate powers of $10$. The prefix $M$ (Mega) stands for $10^6$. If we write $M \, km$,it implies $10^6 \

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Because it is standard practice not to use two prefixes for a single unit.

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(D) In the $SI$ system,prefixes are used to indicate powers of $10$. The prefix $M$ (Mega) stands for $10^6$. If we write $M \, km$,it implies $10^6 \, km$. However,the standard convention in physics is to avoid using two prefixes for a single unit. Since $k$ (kilo) is already a prefix for $10^3$,writing $M \, km$ would mean $10^6 	imes 10^3 \, m = 10^9 \, m$. Therefore,$10^6 \, km$ is equivalent to $10^9 \, m$,which is written as $1 \, Gm$ (Giga-meter),not $M \, km$.

Why can $10^6 \, km$ not be represented as $M \, km$?

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