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Equation of travelling wave on a stretched string of linear density 5 g/m is y = 0.03 sin(450 t – 9x) where distance and time are measured in SI units. The tension in the string is :

1. 10 N
2. 7.5 N
3. 5 N
4. 12.5 N

Correct answer: 12.5 N

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