My! You must be suffering an identity crisis! You've posted 7 physics questions under 7 different names.
Please use the same name for your posts.
A string of length 10.0 m is tied between two posts and plucked. This sends a wave
down the string moving at a speed of 130 m/s with a frequency of 215 Hz. How many
complete wavelengths of this wave will fit on the string?
2 answers
N=L/λ =Lf/v =10•215/130=16.5 => 16
2 answers