The Displacement of Moving Sinusoidal Wave with f equation calculates the displacement of a sinusoidal wave with a velocity, v, and frequency, f.
Reference
Young, Hugh and Freeman, Roger. University Physics With Modern Physics. Addison-Wesley, 2008. 12th Edition, (ISBN-13: 978-0321500625 ISBN-10: 0321500628 ) Pg 493, eq 15.3