Predicted Paper Mistakes

Question 1

Example and advantage of LDRS

Answer 1

Street lamps contain LDR so when it gets dark current is able to flow and light turns on - no human control needed

Question 2

Relationship between resistance and no. Of resistors

Answer 2

Inversely proportional

Question 3

Gamma charge

Answer 3

No overall charges

Question 4

3 precautions taken by staff to limit exposure to radiation

Answer 4

Keep RS shielded when not in use, e.g a lined box wear protective clothing to prevent comtanimation and limit exposure so less time spent with radioactive material and handle R/S with tongs to increase distance

Question 5

Best type of radiation for cancer diagnosis

Answer 5

Gamma - high penetrating power. Should have shirt half life and low ionising power

Question 6

What isotope is best for nucleur fission

Answer 6

Uranium - 235

Question 7

What is produced as a result of nuclear fission

Answer 7

Radioactive waste