A Sample of a Radioisotope Shows an Activity of 999

question 53

Multiple Choice

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope

• A) 4.38 * 10^-2 yr
• B) 11.4 yr
• C) 0.25 yr
• D) 15.8 yr
• E) 9.1 yr

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Definitions:

Metatarsals

The long bones in the foot that extend from the arch to the toes, participating in support and locomotion.

Tibia

The larger, stronger, and anterior of the two bones in the leg below the knee in vertebrates; it supports most of the body's weight.

Talus

A bone in the ankle that sits between the tibia and fibula bones of the lower leg and the calcaneus (heel bone), playing a crucial role in foot movement.

Calcaneus

The large bone forming the heel of the foot, which supports the weight and motion of the body.