Physics IGCSE question Watch

simply_a_ Δ
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So one of the questions included "define half life" (2 marks)
I put "the time it takes for half the radioactivity of the radioactive material to half"... would you say that makes sense and would be able to gain the 2 marks?
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Damien_Dalgaard
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No, the answer is:

The time taken for the amount of radioactive decay to decrease by half

OR

The time taken for half of the radioactive decay present to decay.

With respect, you seem to have waffled, and your definition could be interpreted to mean HALF of the half life!

Look in the cgp guide :d

You doing edexcel?
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Neymar27
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(Original post by Damien_Dalgaard)
No, the answer is:

The time taken for the amount of radioactive decay to decrease by half

OR

The time taken for half of the radioactive decay present to decay.

With respect, you seem to have waffled, and your definition could be interpreted to mean HALF of the half life!

Look in the cgp guide :d

You doing edexcel?
What about 'time taken for half the mass of a radioactive isotope to decay'?
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Damien_Dalgaard
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(Original post by Neymar27)
What about 'time taken for half the mass of a radioactive isotope to decay'?
I quote from my revision guide:

"The half - life t(1/2) of an isotope is the average time taken for half of the active nuclei to decay".

If you are not satisisfied look at a past exam question in your exam board and look at the mark scheme answer, you will be sorted then :yep:

Its not mass though is it? I thought it was radioactive matter smh
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Neymar27
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(Original post by Damien_Dalgaard)
I quote from my revision guide:

"The half - life t(1/2) of an isotope is the average time taken for half of the active nuclei to decay".

If you are not satisisfied look at a past exam question in your exam board and look at the mark scheme answer, you will be sorted then :yep:

Its not mass though is it? I thought it was radioactive matter smh
Must have misread it from the textbook then I guess,,, hopefully one mark anyway for putting a few key words in
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simply_a_ Δ
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(Original post by Damien_Dalgaard)
No, the answer is:

The time taken for the amount of radioactive decay to decrease by half

OR

The time taken for half of the radioactive decay present to decay.

With respect, you seem to have waffled, and your definition could be interpreted to mean HALF of the half life!

Look in the cgp guide :d

You doing edexcel?
Yep I'm doing edexcel :\
Wait, would this definition work "the time it takes for the radioactivity of the radioactive material to half"?
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Damien_Dalgaard
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(Original post by simply_a_ Δ)
Yep I'm doing edexcel :\
Wait, would this definition work "the time it takes for the radioactivity of the radioactive material to half"?

Yes I would agree with that.
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Neymar27
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(Original post by Damien_Dalgaard)
Yes I would agree with that.
I found a definition though for it being 'mass' in the Pearson textbook
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Damien_Dalgaard
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(Original post by Neymar27)
I found a definition though for it being 'mass' in the Pearson textbook
I am doing Physics A2, so maybe the definition is different. Look at a past exam question for your exam board and see what the mark scheme says the definition is.
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Neymar27
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(Original post by Damien_Dalgaard)
I am doing Physics A2, so maybe the definition is different. Look at a past exam question for your exam board and see what the mark scheme says the definition is.
I'll just leave it lol, incase it's wrong and I then think I've gone down even more lol
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Damien_Dalgaard
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(Original post by Neymar27)
I'll just leave it lol, incase it's wrong and I then think I've gone down even more lol
gl
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simply_a_ Δ
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(Original post by Damien_Dalgaard)
Yes I would agree with that.
Thank you for the reply :P as you can tell, I still haven't fully grasped the definition of half life and I'm doing paper 2 IGCSE in a couple of weeks xD
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Neymar27
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Thanks, and im doing IGCSE Edexcel btw
(Original post by Damien_Dalgaard)
gl
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Damien_Dalgaard
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(Original post by simply_a_ Δ)
Thank you for the reply :P as you can tell, I still haven't fully grasped the definition of half life and I'm doing paper 2 IGCSE in a couple of weeks xD
dw I self taught it and as long as you are confident with the material and do all the past papers you'll go far!

The good thing about half life is that the "half" in its name is relevant to the definition, just

(Original post by Neymar27)
Thanks, and im doing IGCSE Edexcel btw
xD, I did that :P
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judezeitoun
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(Original post by Neymar27)
I found a definition though for it being 'mass' in the Pearson textbook
yes it did say mass my school uses the pearson book too
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turn-to-page394
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(Original post by simply_a_ Δ)
So one of the questions included "define half life" (2 marks)I put "the time it takes for half the radioactivity of the radioactive material to half"... would you say that makes sense and would be able to gain the 2 marks?
For igcse edexcel, the mark scheme from past papers gave these definitions:

The time taken (1) for the activity of the radioactive sample to half (1)

The time taken (1) for half of the nuclei / atoms / isotopes to decay (1)

Good luck for the exam btw
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simply_a_ Δ
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(Original post by turn-to-page394)
For igcse edexcel, the mark scheme from past papers gave these definitions:

The time taken (1) for the activity of the radioactive sample to half (1)

The time taken (1) for half of the nuclei / atoms / isotopes to decay (1)

Good luck for the exam btw
Oh wow! Thank you for finding the time to look through the markscheme
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turn-to-page394
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(Original post by simply_a_ Δ)
Oh wow! Thank you for finding the time to look through the markscheme
Oh no, it's fine - I'm taking the exam too and remembered a question like that from past papers.
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Zakariyam10
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(Original post by Damien_Dalgaard)
No, the answer is:

The time taken for the amount of radioactive decay to decrease by half

OR

The time taken for half of the radioactive decay present to decay.

With respect, you seem to have waffled, and your definition could be interpreted to mean HALF of the half life!

Look in the cgp guide :d

You doing edexcel?
the time taken for half the amount of radioactive atom to decay
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Damien_Dalgaard
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(Original post by Zakariyam10)
the time taken for half the amount of radioactive atom to decay
This is the same as what I said.
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