SUMMER FUN: #16

Level 2

Two periodic waves start from opposite sides of a string fixed on both ends. The first wave is described by the equation x = c o s ( 2 π t ) x=cos(2\pi t) . The second wave is described by the equation x = 2 c o s ( 2 π t ) x=2cos(2\pi t) . Which of the following is a possible amplitude of the resultant wave?

5 m .25 m -2.5 m -0.5 m

Lucia and Emma by Lucia and Emma , 20, USA

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