A rope is shaken to make the transverse wave shown. The grid squares are all the same size and one small square stands for a distance of 1 cm in every direc...
Question 1 Report
A rope is shaken to make the transverse wave shown. The grid squares are all the same size and one small square stands for a distance of 1 cm in every direction. 
What is the amplitude of this wave?
Answer Details
The correct answer is 3 cm. The amplitude is the maximum displacement from the rest position (the dashed line). From the grid, the wave peaks 3 squares above the equilibrium line, and each square represents 1 cm, so the amplitude is 3 cm. Choosing 6 cm confuses amplitude with the full crest-to-trough distance (which is twice the amplitude). Choosing 1 cm or 2 cm under-counts the number of squares from equilibrium to peak.
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