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steposvetlana [31]
3 years ago
7

Why do some objects such as windows and doors close in the winter but can be harder to close in the summer?

Chemistry
2 answers:
Elenna [48]3 years ago
4 0
When the temperature rises some materials experience thermal expansion which means they get bigger, so it may make them harder to close because they don't fit as well.
monitta3 years ago
4 0
Because of the temperature rise
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Hydrogen-3 has a half-life of 12.3 years. How long will it take a sample of 88 g of hydrogen-3 to decay to 11 g? Give your answe
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The time taken for Hydrogen-3 to decay from 88 g to 11 g is 36.9 years.

<h3>Half-life:</h3>

This can be defined as the time taken for half the sample of a substance to decay or disintegrate

To calculate the time it will take Hydrogen to decay from 88g to 11 g we use the formula below.

Formula:

  • R = R'(2^{T/n})................ Equation 1

Where:

  • R = Original sample of Hydrogen
  • R' = Sample of Hydrogen left after decay
  • T = Total time of decay
  • n = Half-life of hydrogen.

From the question,

Given:

  • R = 88 g
  • R' = 11 g
  • n = 12.3 years.

Substitute these values into equation 1

  • 88 = 11(2^{T/12.3})

Solve for T.

  • 2^{T/12.3} = 88/11
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  • 2^{T/12.3} = 2³................ Equation 2

Equating the base in equation 2 above,

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  • T = 12.3×3
  • T =  36.9 years.

Hence, the time taken for Hydrogen-3 to decay from 88 g to 11 g is 36.9 years

Learn more about half-life here: brainly.com/question/11152793

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