The Half-Life of a Radioactive Sample Is 60

question 78

Multiple Choice

The half-life of a radioactive sample is 60.0 y. If the sample weighs 0.893 g initially, how much remains after 420.0 y?

• A) 0.00698 g
• B) 0.00968 g
• C) 0.00986 g
• D) 0.00689 g
• E) 0.00896 g

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Definitions:

Middle-Ear Bones

The three small bones in the mammalian ear - the malleus, incus, and stapes - that transmit sound vibrations from the eardrum to the inner ear.

Alveoli

Small air sacs in the lungs where gas exchange between the air and blood takes place, crucial for breathing.

Vertebrae

The individual bones that make up the vertebral column (spine) in vertebrates, providing structural support and protecting the spinal cord.

Testudines

An order of reptiles that includes turtles, tortoises, and terrapins, characterized by a bony or cartilaginous shell developed from their ribs.