Answer
The frequency does not change.
The wavelength increases by 9.3%
Work Step by Step
When a wave moves from one medium to another medium, the frequency does not change.
Since $v = \lambda~f$, and the frequency does not change, then the wavelength must change by the same percentage as the speed changes.
We can find the percentage change of the wave speed:
$\frac{1585~m/s-1450~m/s}{1450~m/s}\times 100\% = 9.3\%$
Therefore, the wavelength increases by 9.3%
