What is the wavelength of a 256-hertz sound
wave in air at stp?
(1) 1.17 × 10^6 m (3) 0.773 m
(2) 1.29 m (4) 8.53 × 10^–7 m

Sound at air in STP travels at 343 m/s.

We also know the formula v=f lambda where v is the velocity, f is the frequency and lambda is the wavelength.

Substituting in values to this, we get:

343 = 256 * lambda
lambda = 343/256
=1.34 3sf

Aaand upon doing this, I realise your textbook wants you to assume the speed of sound to be 330m/s, right then, well changing the value to 330, we get 1.29m

Ireally don’t know