Explain why a smoke alarm works by emitting and detecting alpha radiation instead of gamma or beta radiation.
Alpha radiation isn't very penetrating and so is absorbed and stopped by smoke particles. This causes a change in count rate when there is smoke present. This change in count rate allows the alarm to be triggered.Beta and gamma radiation aren't stopped by smoke particles and so there would be no change of count rate when smoke is present.
FM
Related Physics GCSE answers
All answers ▸What are the two types of waves and what are some of their uses/sources?
Explain what led to the plum pudding model of the atom being replaced by the nuclear model of the atom.
A coal fire is burning in the bottom of a furnace, with a chimney above it. Air moves into the furnace from an opening at the bottom and up the chimney. Describe how the process of convection causes this air movement.
Calculate how much charge flows through a circuit with 6.0A of current in seven minutes?