| (i) What are nanosecond and microsecond? |
| (ii) Change 30 km/hr into m/s. |
Answer:
(i) 1 microsecond\[={{10}^{-6}}sec\]. 1 nanosecond \[={{10}^{-9}}see\] (ii) 30 km in 1 hour means \[30\times 1000\text{ }m\text{ in }1\times 60\times 60\] seconds \[\text{speed}=\frac{30\times 1000}{60\times 60}=8.33\,m/\sec \].
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