Explain the : A bigger raindrop falls faster than smaller one.

Explain the : During falling of a stream of water the stream gets narrower at the bottom.

State any one reason to explain why RNA viruses mutate and evolve faster than other viruses

27 drops of same size and having equal and similar charge coalesce to form a bigger drop. Calculate the ratio of capacities of bigger drop to the smaller drop.

Explain why the size of a cation is smaller than that of corresponding neutral atom and it is reverse for an anion.

Explain why radii of positive ions are always smaller than the radii of corresponding neutral atoms and why negative ions have larger radii than the corresponding neutral atom.

The radii of two concentric circles are 13 cm ad 8 cm. AB is a diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E. Point A is joined to D. The length of AD (in cm) is___

State whether True or False : In a vaccum place a gold coin will fall faster than a feather.

The force of gravitation on all objects is directly proportional to their masses, yet a heavy body does not fall faster than a light body. Why ?

Explain why sodium is less reactive than potassium.

Explain why is sodium less reactive than potassium.