1. The problem The distance between two consecutive nodes of a standing wave is 21.9 cm. The hand generating the pulses moves up and down through a complete cycle 3.72 times every 4.22 s. Find the velocity of the wave. Answer in units of m/s 2. Some relevant things to know are: Frequency equals the number of vibrations a wave makes per second to measure the wavelength of a wave, you must have the length between either: A) two antinodes (peaks,trofts,crests,etc.) or B) THREE nodes. Since we only know the lenght between two nodes, it is assumed that we can multiply the distance (21.9 cm) by 1.5 to figure out the distance between three nodes. and finally, once you determine both the frequency and the wavelenght, you must know how to deduce the velocity out of both. the equation for that is v=fλ 3. Attempts I have attempted this problem several times using the above equations and methods. I came upon the answer 28.9578199052 m/s (≈29m/s) but apparently that is wrong. Thank you for any help you can provide, cheers! Edit: my sincere apologies for butchering the template, sorry, I'm new here!