For an organ pipe of length L, the fundamental frequency is proportional to
A L B L C L^-1/2 D L^1/2

For a certain standing wave set up in a stretched string the distance from the 2nd node to the 5th node is 60 mm. The wavelength of the standing wave is
A 20 mm B 30 mm C 40 mm D 50 mm

Listed below are frequencies of tuning forks that are to be sounded in pairs. The largest number of beats will be heard from which pair of tuning forks?
A 201 and 200 Hz B 253 and 260 Hz C 535 and 540 Hz D 1420 and 1424 Hz

(i) How are standing (stationary) waves formed? (2 marks)
(ii) State four features that distinguish a travelling (progressive) wave from a standing (stationary) wave. (4 marks)

Explain the formation of beats. (3 marks)