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i)ensured supports of pendula were rigged
ii)avoided parallax error on meter rule/stop watch

1bi)
simple harmonic motion is the motion of a body whose acceleration is always direct towards a fixed point and is proportional to the displacement from the fixed points

1bii)
T=1.2secs
Log 1.2=0.079
0079 shown on graph with corresponding Log L read L correctly determined

3axi)
i)ensured clean/tight terminals
ii)open key when reading was taken

3bi)
i)brightness of the bulb increases
ii)voltage/current through the bulb increases

3bii)
i)diode
ii)transistor

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