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valkas [14]
3 years ago
7

For electricity to flow, what do you need?

Chemistry
2 answers:
jek_recluse [69]3 years ago
5 0

Answer:

D

Explanation:

you need battery, light bulb and wire in a close circuit

sashaice [31]3 years ago
4 0

Answer:

D - a battery, light bulb and wire in a closed circuit.

Explanation:

A battery due to the charge in it.

A light bulb so the energy has somewhere to go to.

A wire in a closed circuit, so that the energy has a place for transport without interruptions.

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While exploring a coal mine, scientists found plant fossils in the ceiling of the mine which had been preserved by an earthquake
ale4655 [162]

Answer:

11552.45 years

Explanation:

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t_{1/2}=\frac{\ln2}{k}

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k=\frac{\ln2}{t_{1/2}}

k=\frac{\ln2}{5730}\ years^{-1}

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Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given that:

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Final concentration [A_t] = 40.0 counts/min

Time = ?

Applying in the above equation, we get that:-

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7 0
3 years ago
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