Heya!!
For calculate wavelength, lets applicate formula:
[tex]\boxed{\lambda = V/f}[/tex]
Δ Being Δ
f = Frequency = 50 Hz
v = Velocity = 340 m/s
[tex]\lambda[/tex] = Wavelenght = ?
⇒ Let's replace according the formula:
[tex]\boxed{\lambda = 340\ m/s / 50 \ Hz }[/tex]
⇒ Resolving
[tex]\boxed{\lambda = 6,8\ m}[/tex]
Result:
The wavelength is 6,8 meters.
Good Luck!!