1. The problem statement, all variables and given/known data A stretched wire vibrates in its fundamental mode at a frequency of 400Hz. What would be the fundamental frequency if the wire were half as long, with twice the diameter and with four times the tension? 2. Relevant equations fn = nV / 2L where n is the harmonics number. f1 is the fundmental frequency. i think i should be using V= Sqrt(T/u) 3. The attempt at a solution how do i start? this is what i got... since it gave 400Hz... then i think i should use... fn = nV/2L -----> 400Hz = V/2L therefore V= 400 * 2L using V= Sqrt ( T/u) ---> 400*2L= Sqrt( T/U) ---- i am stuck here...i have a hunch that i need to find something it term of something that play back the two equation..afterwhich it will cancel out something..then i can get the value...dunno where to go from here...any hel thanks??