Given wave function for a wave to be $\psi(x, t)=10^3 \sin \left(3 \times 10^6 x-9 \times 10^{14} t\right)$ The speed of the wave is
Answer & explanation
Correct answer: option 1
$c=\omega / k=\frac{9 \times 10^{14}}{3 \times 10^6}=3 \times 10^8$
∴ (A)