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ipn [44]
2 years ago
14

If we start with 48 g of a radioactive substance with a 2 hour 12 life, how much is left after two half-lives?

Physics
1 answer:
ivolga24 [154]2 years ago
4 0

Explanation:

 Half-life is the time taken for a radioactive material to decay to half its original composition:

   Original mass = 48g

   Half- life  = 2hr

 

 After four half lives;

           Initially:                48g

    First halving                24

    Second halving          12

    Third halving               6

    Fourth halving             3

After second half life, we would have 12g

At fourth halving, we would have 3g

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Valentin [98]

When a body performs a uniform circular motion, the direction of the velocity vector changes at every moment. This variation is experienced by the linear vector, due to a force called centripetal, directed towards the center of the circle that gives rise to centripetal acceleration, the mathematical expression is given as,

a = \frac{v^2}{r}

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7 0
3 years ago
Define unit of electric work (JOULE) in relation to quantity of charge and potential difference.
astraxan [27]
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3 years ago
An external computer flash drive can hold I gigabyte of data.How many bytes is this
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Two Carnot air conditioners, A and B, are removing heat from different rooms. The outside temperature is the same for both rooms
lakkis [162]

Answer:

(a)  333.77 J

(b) 237.85 J

(c) 4763.77 J

(d) 4667.85 J

Explanation:

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Temperature of B, Tc' = 298 K

heat taken out, Qc = 4430 J

Let the heat deposited outside is QH and QH' by A and B respectively.

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W = QH - QC = 4763.77 - 4430 = 333.77 J

(b) Work done for B

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(c) QH = 4763.77 J

(d) QH' = 4667.85 J

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