B: few centimetres positive
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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…
In which situation do sound waves not travel?
A wave in a ripple tank passes from a deeper to a shallower region and refracts. Which wave properties decrease as th…
A ray of light is incident on the surface of a glass block, as shown in the diagram below. The refractive index of th…