NB: This is the complete question
A string of length 0.620 m is vibrating at 125 Hz in its second harmonic and producing sound that moves at 340 m/s .
What is true about the frequency and wavelength of this sound?
A:The wavelength of the sound is 0.80 m .
B: The wavelength of the sound is 2.72 m .
C:The frequency of the sound is 125 Hz .
D:The frequency of the sound is 425 Hz .
Answer:
Step-by-step explanation:
let f1 = frequency of the first harmonic and
f2 = frequency of the second harmonic
f2 = 2f1
f1 = 125/2
f1 = 62.5 Hz
f2 = speed/ wavelength
f2 = 340/125
f2=2.72 m