Initially a Mixture of Two Radioactive Sources Contains the Same

question 31

Multiple Choice

Initially a mixture of two radioactive sources contains the same number of nuclei of source A and source B.The half-life of A is 2 hours,and the half-life of B is 3 hours.What will be the ratio of remaining nuclei of A divided by remaining nuclei B after 12 hours? (Assume A does not decay into B or vice-versa.)

• A)0.250
• B)0.125
• C)0.5
• D)0.0625
• E)None of these is correct.

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Definitions:

Mites

Small arthropods belonging to the class Arachnida, often parasitic, affecting plants, animals, and humans.

Horseshoe Crabs

Ancient marine arthropods known for their distinctive horseshoe-shaped carapaces and important role in medical research.

Scorpions

Arachnids known for their venomous stings, eight legs, and distinctive extended body with a segmented tail.

Spiders

Arthropods belonging to the class Arachnida, characterized by eight legs, silk-producing spinnerets, and a two-part body consisting of a cephalothorax and abdomen.