An acoustic surveyor is calibrating equipment on a wide, flat salt flat. They stand at a marked distance of 1.5 km from a controlled pyrotechnic charge.
When the charge is detonated, a bright flash is observed and a loud boom is heard.
Describe how the surveyor can measure the time taken for the sound wave to travel the 1.5 km distance.
64 exam-style questions on Edexcel GCSE Physics 4.1 Wave properties. Each one has a worked solution and a mark scheme showing where the marks go.