# Waves, finding frequency, wavelength, and speed

by aliaze1
Tags: frequency, speed, wavelength, waves
 P: 177 I am assigned the even problem for homework, but I am lost, so I found an odd problem with the same type of question and has the answer.... I just need to know how the calculations are done 1. The problem statement, all variables and given/known data The displacement of a wave traveling in the negative y-direction is D(y,t)=(5.2cm)sin(5.5y+72t), where y is in m and t is in sec. Find the frequency, wavelength and speed of the wave 2. Relevant equations D(x,t) = A sin[2π (x/λ -t/T) + Φ] 3. The attempt at a solution I have no clue, the answers are: 11.5 Hz 1.14 m 13.1 m/s
 P: 100 Well I'll help get you started. By comparing the two equations, you know that $$5.5 = \frac{2\pi}{\lambda}$$ So you can easily find the wavelength. How can you find the frequency in a similar manner? What is the relationship between frequency and period? When you have the frequency and wavelength, what is the relationship between those and velocity?
 P: 177 Thanks!

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