1.

The speed of light in vacuum is 3xx10^(8)m//s. How many nanosecond does it take to travel one metre in a vacuum?

Answer»

`8ns`
`10/3ns`
`3.34ns`
NONE of these

Solution :(B) `t=s/v=1/(3XX10^(8))=1/3xx10^(-8)s`
`=1/3xx(10^(-8))/(10^(-9))ns=10/3ns`


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