Dear all,

In my text book it is written that when a string clamped at both ends oscillates in it's fundamental mode then the frequency of the stationary wave set up in the string is given by f=v/2l .where 'f' means frequency,'v' means speed of wave and 'l' is the length of string.following are my doubts

1.since wave is stationary not travelling so its speed should be zero always?if it is not then what is the meaning of speed in a stationary wave and what is its formula?

2.they used the formula v=square root of T/m.where 'T' is the tension in string and 'm' is the mass per unit length of the string.but as far as i know this formula is derived for a travelling wave not for stationary wave then why did they use it.please explain

Thanks

Arvind