Waves and Sound question bank (Physics)

In a resonance tube the first resonance with a tunning fork occurs at $16 \mathrm{~cm}$ and second at $49 \mathrm{~cm} .$ If the velocity of sound is $330 \mathrm{~m} / \mathrm{s}$, the frequency of tunning fork is

Equation of two simple harmonic waves is given by $\mathrm{Y}_1=2 \sin 8 \pi\left(\frac{\mathrm{t}}{0.2}-\frac{\mathrm{x}}{2}\right) \mathrm{m}$ and $\mathrm{Y}_2=4 \sin 8 \pi\left(\frac{\mathrm{t}}{0.16}-\frac{\mathrm{x}}{1.6}\right) \mathrm{m}$ then both waves have