Which of the following statements is wrong?

Options

A. Area of cross-section of nucleas in about 1 barn `(1 "barn" = 10^(-24)cm^(2))`
B. Elements placed below the belt of stablility shwo positorn emission to increase their `(n)/(p)` ratio
C. Elements placed above the belt of stablility show `beta-` emission to decrease their `(n)/(p)` ratio
D. `K-` electron capture emits `gamma` rays.

Answer

`(d)`

Explanation

`K-` electron caputre always give `X-` rays due to jump of electron from higher energy level to `K-` shell in order to fill the vacancy created by `K-` electron capture.
`._(37)^(81)Rb + ._(-1)^(0)e overset("K-electron caputure")(rarr) ._(26)^(81)Kr + "X-ray"`