Which step in the decay scheme explains how Pb-219 ends up in rain water while its parent U-238 is only present in earth's crust?
A
238U−234U
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
234U−230Th
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
230Th−226U
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
226Ra−222Rn
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is D226Ra−222Rn The step 226Ra−222Rn in the decay scheme explains how 219Pb ends up in rain water while its parent 238U is only present in earth's crust.
222Rn is a gas and enters earths atmosphere through which it enters rain water.