$_6C^{14}$ is formed from $_7N^{14}$ in the upper atmosphere by the action of the fundamental particle:

Which one of the following nuclear transformations is of the $(n, p)$ type?

Artificial transmutation was discovered by

In the nuclear reaction $_7N^{14} + _2He^4 \to _ZX^A + _1H^1$,the product nucleus $_ZX^A$ formed is:

In the following nuclear reactions $_7N^{14} + _2He^4 \to _8O^{17} + X_1$ and $_{13}Al^{27} + _1D^2 \to _{14}Si^{28} + X_2$,$X_1$ and $X_2$ are respectively:

The age of the most ancient geological formations is estimated by: