This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Okay... on air, sound travels at 342 meters per second
Then the frequency of sound is 1/t (q stands for the time period)

Then we know that speed is equal to distance over time (s=d/t)

Then the final equation would be like this s=dt  ---> s=dx (1/t) --->

342 meters/50 hz = 6.84 meters. The wavelength of 50 Hz of sound in air is 6.84 m.

This would be the answer if that sound in the problem is travelling in air. If it is travelling in water, or in solid, then its another story.