Difficult
Define the meter.
The meter is the $SI$ unit of length.
It is defined as the distance traveled by light in vacuum during a time interval of $1/299,792,458$ of a second.
It is defined as the distance traveled by light in vacuum during a time interval of $1/299,792,458$ of a second.
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$(ii)$ $\frac{(3.4 \times 10^{-3})}{(6.5 \times 10^{-7})}$
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