posted by Zoe .
By what factor would you have to decrease the tension in a stretched string in order to decrease the wave speed by a factor of 3.5?
I know that v = sqrt(T/u) but am confused as to what to do?
To reduce v by a factor of 3.5, T must decrease by a factor of 3.5^2.
The formula v = sqrt(T/u) tells you that.