Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

Helium is formed as a byproduct of alpha decay, which is a type of radioactive decay in which an atomic nucleus emits an alpha particle consisting of two protons and two neutrons.

Because helium is a very light gas, it can be easily occluded or trapped within the lattice structure of certain minerals, especially those that are formed in geologically active areas with high levels of radioactivity. This process is known as radiogenic helium trapping.

Some common minerals that are known to contain significant amounts of radiogenic helium include zircon, apatite, and uraninite, which are often used in geochronology and other geological studies to determine the age of rocks and geological formations. The measurement of radiogenic helium in these minerals can provide important information about the timing and nature of geological processes such as volcanic eruptions, mountain building, and the formation of minerals and ore deposits.

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