Question 1

1. c

2. minimum, maximum, minimum

   maximum, minimum, maximum

   minimum, maximum, minimum

3. 17.1/10 = 1.71

   1.71^2 = 4 pi^2 x 0.725/g

   1.71^2/4 pi^2 = 0.725/g

   0.074 = 0.725/g

   g = 0.725/0.074

   g = 9.8 ms^-2

4. The measurement of L or T may not be accurate

5. GPE = KE

   mg (h1-h2) = KE

   2000 x 9.81 (12.5-4.5) = 156960

   = 160kJ

6. Some energy will be lost due to air resistance

Question 2

1. This is because smoke will travel upwards due to convection currents. It is less dense than the cold air particles and therefore will rise.

2. Highly ionizing] and weakly penetrating.

3. a

4. b, because isotopes have different number of neutrons but the same amount of protons so the atomic number will remain the same as 95

5. 420 years

6. 10,000, 5000, 2500, 1250, 625 = 4 half lives

   420 x 4 = 1680 years

7. This would not function correctly with a radioactive isotope that emits beta or gamma radiation because they are highly penetrating so the radiation would go through the smoke and the alarm would not go off.

Question 3

1. If the diameter of the cylinder increases, then the resistance would decrease because the electrons would have more pathways to travel through.
2. Material C
3. Because the length needs to be the same and only diameter of the cylinder must change to ensure that the results are accurate
4. / table