The straight lines represented by the equation $9x^2 - 12xy + 4y^2 = 0$ are

The equation of a stationary wave along a stretched string is given by $y = 5 \sin \frac{2\pi}{3}x \cos 40\pi t$,where $x$ and $y$ are in $cm$ and $t$ is in $s$. The separation between two adjacent nodes is ..... $cm$.

The formula of sodium nitroprusside is .........

What is common between vegetative reproduction and apomixis?

Which of the following ethers cannot be produced by Williamson ether synthesis?

The distance between the lines represented by $4x^2 + 20xy + 25y^2 + 2x + 5y - 12 = 0$ is equal to