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## Homework Statement

A wave is described by y=12sin(4t-8x). What is its propagation speed?

A. 0.2

B. 0.5

C. 4

D. 8

E. 12

## Homework Equations

v=wavelength/period

v=wavelength×frequency

## The Attempt at a Solution

period= 2π/w=2π/8=.7853

But confused on how to find the wavelength?