Exercise Set 1a – Units and Significant Figures
1. How many millimetres (mm) in a kilometre (km)?
2. How many microamperes (µA) in a milliampere (mA)?
3. How many nanokelvins (nK) in a millikelvin (mK)?
4. How many picograms (pg) in a decigram (dg)?
5. Calculate 70.2 x 34.2 and express the answer correct to two significant figures.
6. Calculate
7. Calculate
0.6 × 7020.096
0.096
and express the answer correct to two significant figures.
0.8235 × 445.7
and
76.9 × 0.0093
express the answer correct to two significant figures.
8. What is the order of magnitude of 73.6?
9. What is the order of magnitude of 3.5 × 106 × 9.2 × 10−4 ?
10. What is the order of magnitude of the number of seconds in a year?
11. Express 0.003778 in scientific notation.
12. Express
2.64
5.96×24.2
in scientific notation.