Which equation shows the relationship between the numbers of parent and daughter nuclei after one half-life of a radioactive isotope has passed?
A. Parent nuclei = 2 x daughter nuclei
B. Parent nuclei = daughter nuclei
C. Parent nuclei = 0
D. Daughter nuclei = 2 x parent nuclei

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

Can you show the