If the first harmonic wavelength in an open ended tube is 35 cm, what is the 7^{th }wavelength?

5 cm

28 cm

42 cm

2.5 m

3.5m

We will use the equation λ_{n} = λ_{1}/n.

We plug in our known values and get λ_{7} = .35/7 = .05m, or 5cm.