What is $Anthoceros$?

At what speed should a source of sound move so that a stationary observer finds the apparent frequency equal to half of the original frequency?

Which is the most widely cultivated fiber-yielding crop in India?

The equation of the straight line perpendicular to the straight line $3x + 2y = 0$ and passing through the point of intersection of the lines $x + 3y - 1 = 0$ and $x - 2y + 4 = 0$ is

The plates of a parallel plate capacitor are charged up to $100 \, V$. $A$ $2 \, mm$ thick plate is inserted between the plates. To maintain the same potential difference,the distance between the capacitor plates is increased by $1.6 \, mm$. The dielectric constant of the plate is:

In which of the following arrangements,the order is $NOT$ according to the property indicated against it?