Frequency for resonance to occur

[tnich]

Maybe
$L_3(\lambda')$ = $\frac{5}{4}\lambda$ - ε
0.151 = $\frac{5}{4}\lambda$ - 0.008
$\frac{5}{4}\lambda$ = 0.159
$\lambda$ = 0.2 * 4/5 = 0.16 = 0.2 m

That way, frequency = 340/0.2 = 1700 Hz

Here is what I think happened. Whoever made the answer key thought $L_3(λ') = \frac 4 5 λ'-ε$. That would give 1710hz for the frequency. Rounding to 2 significant digits, it would be 1700hz.

 

[Helly123]

Here is what I think happened. Whoever made the answer key thought $L_3(λ') = \frac 4 5 λ'-ε$. That would give 1710hz for the frequency. Rounding to 2 significant digits, it would be 1700hz.

How can you assume the 1710 Hz? How to get that result?

 

[tnich]

How can you assume the 1710 Hz? How to get that result?

Using $\frac 4 5 λ$ instead of $\frac 5 4 λ$, but that would not be correct.

 

[Helly123]

Ok thanks