The Half Life Period Of A Radioactive Substance Is Best Determined By Counting The Number Of Alpha Particles Emitted Per Second In A Geiger Muller Counter From Its Known Quantity. If The Half Life Period Of A Radioactive Substance Is One Month, Then A. 3/4th Of It Will Disintegrate In Two Months. B. It Will Completely Disintegrate In Two Months. C. It Will Completely Disintegrate In Four Months. D. L/8th Of It Will Remain Intact At The End Of Four Months.