# Edexcel P2 Tomorrow

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#1
I recall seeing a post for C2 where people asked questions and the next post answered and gave another question. Let's start one for P2

What is a model for radioactive decay?

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4 years ago
#2
(Original post by harry_16)
I recall seeing a post for C2 where people asked questions and the next post answered and gave another question. Let's start one for P2

What is a model for radioactive decay?

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Half life; the average time it takes for half the undecayed nuclei to decay?

Explain why a resistor gets hot when a current passes through it?
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4 years ago
#3
My book says as its random - the model can be throwing a dice or flipping a coin
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4 years ago
#4
(Original post by sapphire79)
Half life; the average time it takes for half the undecayed nuclei to decay?

Explain why a resistor gets hot when a current passes through it?
The electrons colliding with the ions in the lattice of the resistor- these collisions give the resistor thermal energy
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#5
Sapphire, your definition for half life is correct but remember that the model is flopping a coin because the process of radioactive decay is completely random just like the probability of getting heads or tails.

Explain how alpha particles are used in a smoke alarm.

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4 years ago
#6
(Original post by harry_16)
Sapphire, your definition for half life is correct but remember that the model is flopping a coin because the process of radioactive decay is completely random just like the probability of getting heads or tails.

Explain how alpha particles are used in a smoke alarm.

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There is a source of alpha radiation in the smoke alarm between two electrodes which emits a constant stream of alpha radiation. The alpha particles ionise the particles of air forming cations (+ve ions) & electrons (-ve). They both move to the opposite charged electrodes forming a small current across the gap. As long as there is a current the alarm does not sound. When there is a fire the smoke particles absorb the alpha nuclei reducing the flow of current across the gap. When the current stops flowing the alarm will sound.
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4 years ago
#7
What are the advantages of nuclear power?
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4 years ago
#8
(Original post by J__)
What are the advantages of nuclear power?
It's a fairly clean fuel, and also can produce plentiful energy with a small quantity of nuclear material.
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4 years ago
#9
Why do the properties of alpha particles make them very ionising?
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4 years ago
#10
(Original post by SophFlorence)
Why do the properties of alpha particles make them very ionising?
alpha particles have lots of energy so they can ionise lots atoms in a short distance?? im not sure

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4 years ago
#11
How can a leak in a water pipe be detected?

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4 years ago
#12
(Original post by ksj.11)
alpha particles have lots of energy so they can ionise lots atoms in a short distance?? im not sure

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Pretty much, yes! It's also because they are slow-moving. Thus, when moving past an atom, there's a higher chance of it coming into contact with it, and knocking an electron off. The part about the short distance is particularly right, because since they are slow-moving, they have a higher chance of coming into contact with an atom, and so will be stopped more quickly, hence they do not penetrate far into material.
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4 years ago
#13
(Original post by ksj.11)
How can a leak in a water pipe be detected?

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A gamma source is added to the water, and a GM tube is placed outside the water pipe. If there's a leak, the GM tube will detect higher levels of radiation than if there was not a leak.
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4 years ago
#14
How'd everyone find it?

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4 years ago
#15
(Original post by SophFlorence)
How'd everyone find it?

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Found it really good!! You?
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4 years ago
#16
(Original post by J__)
Found it really good!! You?
AW, good! Yeah, also very good thanks!
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