During a radioactivity experiment, the background reading is 28 counts per minute. A radioactive source is placed 2 cm in front of a detector which is connected to a counter. [Figure] Counter readings are taken with and without sheets of different materials placed between the source and the detector. [Table: type of sheet (no sheet, thin card, 5 mm thick aluminium), reading/counts per minute (750, 750, 478)]. Which types of radiation are being emitted by the source?

In one radioactive decay, radium (Ra) gives rise to radon (Rn) as shown. ²²⁶Ra → ²²²Rn ⁸⁸ ⁸⁶ What particle is also pr…

Which row is correct for fission and for fusion?

When a sample of a radioactive nuclide decays, the count rate falls from 1200 to 150 in three minutes. What is the ha…

A partially-inflated balloon is placed inside a bell jar. The bell jar is connected to an air pump. The air pump is s…

A ball is held at rest on one side of a curved track. The ball is released. It rolls down one side of the track and p…

A transformer connected to a 240V mains supply is used to light a 24 W lamp. The input current to the transformer is …