The telemetry signal from a Martian rover travels a distance of 7.50 × 1010 m to reach Earth.
Electromagnetic waves take 250 s to travel this distance.
A green laser on the rover operates at a wavelength of 520 nm.
Calculate the frequency of the green laser light, using only the data provided.
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.