1. The electrical resistance of a wire varies with length as indicated in the table. Resistance/ 1.9 3.6 Ω Length /m 5.0 Time / 0 min 2.5 Count 160 110 80 60 rate/ c.p.s 2 6.0 4 6 2.8 7.0 a. Plot a graph of resistance (y-axis) vs. length (x-axis). 2. Richard conducted an experiment to find the count rate of radioactive source over a period of time. The following results were obtained. 8 40 3.1 8.0 10 30 20 12 a. Determine the dependent and independent variables b. Plot a graph of count rate against time. 9.0 15 10 8 14 4.1 10.0 5 4 16 18 20 22

Fig: 1