. The linear density of a vibrating string is $1.3 \times 10^{-4} \mathrm{~kg} / \mathrm{m} . \mathrm{A}$ transverse wave is propagating on the string and is described by the equation $\mathrm{Y}=0.021 \sin (\mathrm{x}+3 \circ \mathrm{t})$ where $\mathrm{x}$ and $\mathrm{y}$ are measured in meter and t in second. Ten sion in the string is A $\quad 0.12 \mathrm{~N}$ B $\quad 0.48 \mathrm{~N}$ C $1.20 \mathrm{~N}$ D $4.8 \mathrm{oN}$