Calculate the speed of a sound wave whose wavelength is 0.8m and frequency is 890 Hz.

We know that, Speed (v)= Wavelength $\left(\lambda \right)$ x frequency (f)

According to the question,

Wavelength $\left(\lambda \right)=0.8 \mathrm{m}$
Frequency $\left(f\right)=890 \mathrm{Hz}$
Speed $\left(v\right)=f\times \lambda$
$\Rightarrow v=0.8\times 890$
$\Rightarrow \mathrm{v}=712 \mathrm{m}/\mathrm{s}$