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A standing wave on a string has nodes at x = 0 cm, x = n...

A standing wave on a string has nodes at x = 0 cm, x = n cm, x = 2n cm, and x = 3n cm, where n is a natural number. Which of the following is the wavelength of the travelling waves that combine to make this standing wave?

a)1/2 n cm

b)n cm

c)2n cm

d)4n cm

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