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 $SI$ united. The tension in the string is ... $N$
  • A$10$
  • B$7.5$
  • C$12.5$
  • D$5$
JEE MAIN 2019, Medium
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