hey, i need some help for this question/ Question: A wave passes by two little decoy ducks which are vibraing in opposite phase. They are 1.5m apart. ive two possible wave lengths for this situation. So im guessing you have to make up a frequency and velocity, so i was gonna use 1000Hz and velocity of 10m/s, to make things easier. Also, since its in opposite phase isnt that half a wavelength? also does anyone know the standard intensity of a standard earthquake??