A String Is Connected to a Tuning Fork Whose Frequency $\times$

Multiple Choice

A string is connected to a tuning fork whose frequency is 80.0 Hz and is held under tension by 0.500 kg. The tuning fork causes the string to vibrate as shown. The mass per unit length for the string is

A) 9.45 $\times$ 10^-4 kg/m
B) 6.80 $\times$ 10^-3 kg/m
C) 4.34 kg/m
D) 6.00 $\times$ 10^-3 kg/m
E) 3.85 $\times$ 10^-2 kg/m