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The string of monochord , vibrates 100 times a second. Its length is doubled and its tension is altered unitl it makes 150 vib/s . What is the ratio o

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The string of monochord , vibrates 100 times a second. Its length is doubled and its tension is altered unitl it makes 150 vib/s . What is the ratio of the new tension to the string increases by a force ?
A. `1:9`
B. `9:1`
C. `1:3`
D. `3:1`
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Correct Answer - B
`T_1/T_1 =(n_2/n_1)^2xx(l_2/l_1)^2 = 2.25xx4 = 9.1`
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