The hand of a man,the wing of a bat,and the flipper of a seal represent:

Two identical balls $A$ and $B$ are released from the positions shown in figure. They collide elastically on the horizontal portion $MN$. The ratio of the maximum height attained by $A$ and $B$ after the collision will be: (neglect friction)

What is the nucleus of a bacterium known as?

Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because

Which mixture forms a buffer when dissolved in $1 \, L$ of water?

$A$ nucleus of an element $_{84}X^{202}$ emits an $\alpha$-particle first,a $\beta$-particle next,and then a gamma photon. The final nucleus formed has an atomic number: