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maturk

Another waves question help

Yooooooooooo! I've once again found another question about waves that I'm unable to answer. This one is from November 2009 HL paper 1.

 

I know how to do number 14, that's a pretty basic one; however, I'm stuck on number 15. The answer is supposed to be B (0.8 cm), does anyone understand how to get to that answer? If so, could you explain?

 

Thank you in advance :) CHEERS!

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The displacements of the beads in Diagram 2 from their initial positions in Diagram 1 are:

0cm, 0.5cm, 0.8cm, 0.5cm, 0cm, -0.5cm, etc

So the best estimate of the amplitude is 0.8cm. (Answer B)

 

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