Question

Question #fb7d5

Answer 1

Slide the slide so as to increase the length of the air column that is resonating.

Explanation:

The relationship between the speed of sound, `v`; wavelength, `lambda`; and frequency, `f`, is
`v = lambda*f`.
If we assume that `v` is constant and if `f` is decreased, then `lambda` will be increased.

I hope this helps,
Steve