Rope pulse
A pulse travels 7.2 m in 1.8 s. Explain what travels and calculate its speed.
STRUCTURED PRACTICE
Waves
Attempt every visible question before using the hint or full examiner-style solution.
Sound model
Describe molecule motion in a sound wave travelling right and define a compression.
Phase calculation
Two points are 0.30 m apart on a wave of wavelength 1.20 m. Find phase difference.
Boundary change
A 600 Hz wave slows from 300 m s⁻¹ to 240 m s⁻¹. Find both wavelengths.
Two graphs
A space graph gives λ = 0.45 m and a time graph gives T = 0.015 s. Find f and v.
Spherical source
Intensity is 50 W m⁻² at 3.0 m. Find it at 12 m.
Ultraviolet
Find the frequency of 300 nm radiation and state one risk.
Crossed analyser
Plane-polarised light of 120 W m⁻² reaches an analyser at 60°. Find output intensity.