Q2. The equation of stationary wave is : $y = 2 a \sin \left( \frac { 2 \pi n t } { \lambda } \right) \cos \left( \frac { 2 \pi x } { \lambda } \right)$. Which of the following is NOT correct :\\
(1) The dimensions of $n / \lambda$ is $[ T ]$\\
(2) The dimensions of n is $\left[ \mathrm { LT } ^ { - 1 } \right]$\\
(3) The dimensions of $x$ is [L]\\[0pt]
(4) The dimensions of nt is [L]