A sound pulse takes about 0.003 s to travel between two microphones. A student proposes replacing the electronic timer with a stopwatch and moving the microphones closer together. Which assessment is correct?
Both changes decrease the percentage uncertainty in timing
Both changes increase the percentage uncertainty in timing
Only moving the microphones closer decreases the percentage uncertainty
Only replacing the timer decreases the percentage uncertainty
112 exam-style questions on Edexcel GCSE Physics 4.1 Wave properties, covering 4.1.1 Waves transfer energy and information, 4.1.2 Frequency, wavelength, amplitude, period and wavefronts, 4.1.3 Longitudinal and transverse waves, 4.1.4 The wave speed equations, 4.1.5 Measuring wave velocity, and 4.1.6 Calculating depth or distance from waves. Each one has a worked solution and a mark scheme showing where the marks go.