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√ M1 column and label for v,m,1/m, T& Ө shown 1√ M2 units correct 1√ M3 all values for v correct 1√ M4 all values for m correct 1√ M5 all values for 1/m correct 1√ M6 all values for 1/m 3 d.p. 1
√ M7 all values for Ө correct. 1
Num. of √ Marks7 76 65 54 43 32 21 1
(c)√ A y axis labeled Ө and x axis labeled 1/m√ B unit for y axis and x axis are correct√ C even and constant scale for graph
√ √ D D 5 points are plotted correctly√ D 4 or 3 points are plotted correctly
√ E the best straight line is drawn√ F size of graph is more than half of graph paper
Num. of √ Marks17 5
6 4 15 4 14 3 13 3 12 21 1
- Ө is directly proportional to 1/mOr- Ө increases with 1/m
1(base on graph plotted by student)
2(a) i) x is inversely proportional to a 1
ii) If a = 2.0 m 11/a = ½ 0.5 m-1
1From the graph x = 1.5 m 1
iii) Triangle = 1.5/0.6 = 2.5 111
1(b) λ = ax /D = 2.5/D m 1
1Gradient = x/1/x = ax = 2.5/5 = 0.5 m 1
(c) This experiment is done in an open space to reduce the 1 effect of reflection.