Questions are multiple choice. Put your answers in column shown here. You should
ID: 1651417 • Letter: Q
Question
Questions are multiple choice. Put your answers in column shown here. You should work out these questions before you come to the lab to do Answers will be given at the beginning of the lab and you can ask questions then. The laboratory quiz contains some questions similar to these. A. What is the % error for each of the following absolute errors? 1. An error of 2.4 cm in a measurement of 485.0 cm? (1) .49% (2) 0.5% (3) .0049% (4) .005% (5) 4.9% (6) 5% 2. An error of.082 cm in a measurement of 6.742 cm? (i) 0.012% (2) 0.01% (3) 0.12% (4) 0.1 % (5) 1.2% (6) 1% 3. An error of 20000 dyne-cm (3 sig. fig.) in 3.45 times 10^6 dyne-cm. (1) 0.058% (2) 0.06% (3) 0.58% (4) 0.6% (5) 5.8% (6) 6% B. Give the number of significant figures in each measurement. 4. 0.72 cm 5. 0.072 cm 6. 0.0720 cm 7. .003600 cm 8. 360 times 10^7 cm 9. 36200 cm 10. .00005 cm 11. 3 times 10^2 cm 12. 40007 cm C. A certain distance is determined by accurate optical methods to be 7138.2 cm. Suppose that we measure this same distance with various instruments---some fairly accurate, some not so accurate (rather a tiresome job, probably, for a distance as large as 71 m). How should we write the measurement if we measure it to 4 significant figures? (Units are cm for each choice.) (1) 7138 (2) 7.138 times 10^3 (3) 7140 (4) 714 (5) 7.140 times 10^3 (6) 7.14 times 10^3 (7) 7100 (8) 71 (9) 71 times 10^2 (10) 7.1 times 10^3 (11) 7.10 times 10^3 (12) 7000 (13) 7.0 times 10^3 (14) 7 times 10^3 How should we write the measurement if it is measured to 3 significant figures? (Choose from the 14 answers above.) What if the distance is measured to 2 Significant figures? (Choose from the 14 answers above.) What if the distance is measured to 1 significant figure? (could you do this with your eye alone?) (Choose from the 14 answers above.)Explanation / Answer
A)
1)
% error = error * 100 / actual value
= 2.4*100 / 485.0
= 0.49 %
2)
% error = error * 100 / actual value
= 0.082*100 / 6.742
= 1.2 %
3)
% error = error * 100 / actual value
= 20000*100 / 3.45*10^6
= 0.58 %
b)
4)
0.72 cm has 2 significant figures
5)
0.072 cm has 2 significant figures
6)
0.0720 cm has 3 significant figures
7)
0.003600 cm has 4 significant figures
8)
3.60*10^7 cm has 3 significant figures
9)
3.6200 cm has 5 significant figures
10)
0.00005 cm has 1 significant figures
11)
0.3*10^2 cm has 1 significant figures
12)
40007 cm has 5 significant figures
Only 1 question at a time please
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