B: – Z
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When dealing with radioactive materials there are possible dangers. Which statement is correct?
An isotope X is radioactive and has a half-life of 4 years. A sample initially contains 8000 atoms of X. After how ma…
Energy is released in some power stations and in the Sun by either nuclear fission or nuclear fusion. Which type of n…
Below are four statements about the uses of electromagnetic radiation. Gamma rays are used in medical treatment. Infr…
Two straight electrical conductors are parallel to one another. Each carries a current, one into the plane of the pap…
A polythene rod is rubbed with a duster. The duster then attracts small pieces of paper. Are the rod and the duster c…