# Half-Life and Activity: Armor-piercing shells with depleted uranium cores are fired by aircraft a...

## Question

Armor-piercing shells with depleted uranium cores are fired by aircraft at tanks. (The high density of the uranium makes them effective.) The uranium is called depleted because it has had its ${}^{235}\text{U}$ removed for reactor use and is nearly pure ${}^{238}\text{U}$. Depleted uranium has been erroneously called non-radioactive. To demonstrate that this is wrong: Given that the activity of 60.0 g of pure ${}^{238}\text{U}$ is $7.46×{10}^{5}$ Bq. Calculate the activity of 60.0 g of natural uranium, neglecting the ${}^{234}\text{U}$ and all daughter nuclides.

## AnswerChoose the correct answer.Choose all that apply. Correct Partially correct Incorrect Don't Know

1. A
$2.2×{10}^{5}$ Bq
2. B
$7.75×{10}^{5}$ Bq
3. C
$1.5×{10}^{5}$ Bq
4. D
$4.34×{10}^{5}$ Bq

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