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दो तार जो बिलकुल एकसमान है, स्वरमेल में है|जब एक तार के तनाव 21 % की वृद्धि की जाती है तो दोनों को साथ- साथ बजाने पर 1 .5 सेकण्ड में 6 विस्पंदों सुनाई देने लगते है|प्रत्येक तार की प्रारंभिक आवृति ज्ञात कीजिये|

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तार के कम्पन की आवृति का सूत्र
` " "f=(1)/(2L) sqrt((T)/(m))`
दोनों तार बिलकुल एकसमान है अतः L तथा m समान है|
अतः ` " " fprop sqrt(T) `
` " "(f_1)/(f_2)=sqrt((T_1)/(T_2))`
प्रथम स्थिति में, ` " "f_1 =f_2 =f, ` अतः ` T_1 =T_2 =T`
द्वितीय स्थिति में, ` " "f_1 =f, ` अतः T =T
दोनों तारों के बीच सेकण्ड विस्पंद ` =(6)/(1.5) =4`
तनाव बढ़ने पर आवृति बढ़ती है
अतः ` " "f_2 =f + 4," "T_2 =T + (21T)/(100) =(121T)/(100) `
` " "(f)/(f+4)= sqrt((T)/((121T)/100))=sqrt((100)/(121))=(10)/(11)`
` therefore " "f= 40` हर्ट्ज|

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