a problem about WAVES down here?

Question

On a Keyboard you strike middle C, whose frequency is 256 Hz

(a) What is the period of one vibration of this tone?

(b) As the sound leaves the instrument at a speed of 340m/s, what is its wavelenght in air?

** Please show your work and please show the formulas or steps that you used** Make sure to say which answer is for what ().

Answer 1

period =t=1/f=1/256=.00391 seconds

v=lf l=lambda=wavelength

l=v/f=340/256=1.328meters