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Solved physics Paper 5??

F

fb.junks

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Javior said:
if you ve taken your coordinates to 3 sf then should nt your gradient be to 3 or 4 sf?? do correct me if i m wrong
and v kind of you
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Your answer should be of same decimal place as that of uncertainty.
 
B

Binod Shakya

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minie23 said:
June 2003 P5 Question 2

Procedure : 1 . The experiment is set up as shown. Radium source is used since it has a very long half life. As the experiment is performed in a short time interval, there will be no change in count-rate due to decreasing activity of the source.
2. Initially, the radium source is removed and background countrate is measured (Cb) at a given p.d
3.The radium source is placed at a fixed distance 'd' from the aluminium sheet and the countrate is measured. Several values of the countrates are measured and the average value is calculated so as to minimise the effect of the random nature of emission. The true countrate, C, is obtained by subtracting the background countrate(Cb) from the measured countrate.
4. The source is removed, the p.d is changed and recorded. The new background countrate is measures and recorded. The source is then placed at the same distance from the G.M tube and the new countrate is measured and recorded.
5. Aluminium sheet is used as an absorber of alpha and beta particles. Thus, the countrates recorded are due to gamma rays only.

Safety precautions :
1. The source is handled using a pair of tongs.
2. Te source is stored in a thick lead lined box when not in use.
3. Care should be taken no to look directly into the source.
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minie23 said:
June 2003 P5 Question 2

Why cant we use Bismuth??
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kiara15

kiara15

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fb.junks said:
Use the gradient of best fit to calculate y-intercept and then use worst acceptable gradient to calculate y-intercept.The difference of these y-intercepts is the error of the constant.

Nobody is genius.We are all learners.
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well yeah thaanks...:p
 
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