# Half life

Determine the half-life of bismuth, when bismuth weight from the original weight of 32 g was only 2 grams in 242 minutes.

## Correct answer:

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### You need to know the following knowledge to solve this word math problem:

**algebra**- equation
- exponential equation
- geometric progression
**basic functions**- logarithm
- exponential function

### Units of physical quantities:

### Grade of the word problem:

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