What percentage of the population in India is employed in the agricultural sector?

$A$ car is fitted with a convex side-view mirror of focal length $20\ cm$. $A$ second car $2.8\ m$ behind the first car is overtaking the first car at a relative speed of $15\ m/s$. The speed of the image of the second car as seen in the mirror of the first one is

Vessels and Companion cells are characteristics of

What distinguishes an insect from a crustacean?

If the eccentricity of a hyperbola is $\sqrt{3}$,then the eccentricity of its conjugate hyperbola is:

In the Davisson and Germer experiment,the velocity of electrons emitted from the electron gun can be increased by