Paper 2 · Wavelength and speed of a wave from spaced wavefronts

Fig. 6.1 shows eleven evenly-spaced parallel wavefronts, A to K, moving in air. Calculate the wavelength of the wave.

A15 m

B33 m

C16.5 m

D82.5 m

Explanation: The 11 wavefronts span 10 wavelengths over 165 m, so wavelength = 165/10 = 16.5 m. (15 m wrongly divides by 11; 33 m and 82.5 m divide by the wrong number of gaps.)

Derived from ZIMSEC Physics 4023/2 Paper 2 Theory, November 2018, Q6

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Fig. 6.1 shows eleven evenly-spaced parallel wavefronts, A to K, moving in air. Calculate the wavelength of the wave.

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