Hw help please

[Sherif]

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A 75 cm string is stretched between 2 fixed supports. it has resonant frequencies of 420 Hz and 315 Hz with no other resonant frequencies between those two.

A. What is the lowest frequency for this string. I got 180Hz
B. What is the speed of a wave on this string. I got 270 m/s

Did i even do them right, if not can you tell me how? Thanks

 

[Brickhouse]

A 75 cm string is stretched between 2 fixed supports. it has resonant frequencies of 420 Hz and 315 Hz with no other resonant frequencies between those two.

A. What is the lowest frequency for this string. I got 180Hz
B. What is the speed of a wave on this string. I got 270 m/s

Did i even do them right, if not can you tell me how? Thanks

Do your own homework, young man!

 

[Sherif]

Do your own homework, young man!

I did it, that's why there are answers. I am just not sure

 

[IcedCube]

A 75 cm string is stretched between 2 fixed supports. it has resonant frequencies of 420 Hz and 315 Hz with no other resonant frequencies between those two.

A. What is the lowest frequency for this string. I got 180Hz
B. What is the speed of a wave on this string. I got 270 m/s

Did i even do them right, if not can you tell me how? Thanks

a.
n(wavelength/2)=L
fn=n*f1
fn+1=(n+1)*f1

set both sides equal to f1, solve for n, then f1.


b. v=wavelength * frequency

you have frequency from above.

to find wavelength, n(wavelength/2)=L (meters)


btw, ur answers are wrong