i need to know the answer and procedures using formulas of frequency and waves. nothing more. i need to undestand what is going on

1my = 2 mis 4. Two strings of different densities are tied together. A sine 0.5 m wave pulse with wavelength I'm is sent down the first string at 2 m/s as shown in the image For each of the following scenarios, draw the string 5 seconds after the image String A String B a. String A is 4 times more dense than string B b. String A is 9 times less dense than string B