A sound wave has frequency 256 Hz and wavelength 1.3 m. Find velocity.

Speed of sound wave with $f=256\ \text{Hz},\ \lambda=1.3\ \text{m}$$f$$=$$256$$Hz$$,$$\lambda$$=$$1.3$$m$
Answer: $v=f\lambda=256\times1.3=332.8\ \text{m s}^{-1}$.
Method: Wave speed is the product of frequency and wavelength for uniform media. Units: $\text{s}^{-1}\cdot\text{m}=\text{m s}^{-1}$. This value aligns with typical room-temperature air speeds (~330–343 m/s), so it’s plausible. If temperature rose, speed would increase, but frequency remains source-controlled while wavelength adjusts: $\lambda=v/f$. In many NEET problems, medium properties are constant unless stated.