Question

what will be frequency of a wavelength 68 m
with solution

Answer 1

f=wave length /2
=68/2
=34

Answer 2

As You Haven't Mentioned So I Suppose You Are Talking About Sound.
Speed Of Sound = v = 340m/s
Wavelength = ✓ = 68m Is Given
Frequency = F = ?
By Formula
V = ✓F
340 = 68 * F
F = 5Hz
This Is The Solution To The Given Problem.