A fourth form physics student carried out an experiment to determine the average volume of one
grain of lentil pea using a graduated cylinder. She counted out ten (10) batches each containing
50 grains of peas. Water was poured into the graduated cylinder and the water level was read
off after adding each of the 10 batches of peas to the water. The student recorded her
observations as follows:
Number of Batches Added
Water Level Reading After Adding Peas/ml
1
2
14.5
16.7
3
14.9
4
22.1
LO
5
24.7
00
6
27.2
7
29.4
8
32.0
9
33.5
10
36.4
a. Plot a graph of water level reading against number of grains of peas. (10 marks)
b. Determine the gradient of the graph. (5 marks)
c. What does the gradient of the graph tell you? (1 mark)
d. What was the water level reading when 220 peas were added to the water? (2 marks)
e. How many peas were in the water when the level was at 25.0 ml? (2 marks)