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JEE Mains · Physics · STD 11 - 14. waves and sound

\(90 \mathrm{~cm}\) लम्बा एक गिटार का तार \(120 \mathrm{~Hz}\) की मूलभूत आवृत्ति के साथ दोलन करता है। \(180 \mathrm{~Hz}\) मूलभूत आवृत्ति को उत्पन्न करने के लिए तार की लम्बाई_______\(\mathrm{cm}\) होगी। \(...........cm\).

  1. A \(60\)
  2. B \(59\)
  3. C \(58\)
  4. D \(57\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(60\)

Step-by-step Solution

Detailed explanation

\(f =\frac{ nv }{2 \ell}, \text { for fundamental mode } n =1\) \(f =\frac{ v }{2 \ell}\) \(f \propto \frac{1}{\ell}\) \(\frac{ f _1}{ f _2}=\frac{\ell_2}{\ell_1}\) \(\frac{120}{180}=\frac{\ell_2}{90}\) \(\ell_2=60\,cm\)
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