- #1
Elbow_Patches
- 4
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Hello there,
I'd like some help with this question from a sample A level Physics paper (please see the question and mark scheme attached). The issue is with 16 c). If the zero error means that the voltages used are less than they should have been, that makes the resistances calculated less than they should be, so the gradient is less than it should be, so the calculated resistivity is less than it should be. So that means the 'actual' voltages should be more, so the actual resistances are more, so the gradient is more, so the actual resistivity is more. The mark scheme makes two rather ambiguous statements followed by a third that clarifies what they mean "Hence resistivity of the metal will be smaller than the value in (b)"
So I say the direct opposite of what the mark scheme says. Please could anyone here give an opinion? Am I wrong and have just misread the question? Is the mark scheme wrong? Or, as several people in my department hold, I've got the Physics right but am reading the mark scheme wrong or that the mark scheme is poorly worded and ambiguous. I don't think that third statement is ambiguous, I think it makes a very definite statement.
Thanks for any help! :)
Elbow
I'd like some help with this question from a sample A level Physics paper (please see the question and mark scheme attached). The issue is with 16 c). If the zero error means that the voltages used are less than they should have been, that makes the resistances calculated less than they should be, so the gradient is less than it should be, so the calculated resistivity is less than it should be. So that means the 'actual' voltages should be more, so the actual resistances are more, so the gradient is more, so the actual resistivity is more. The mark scheme makes two rather ambiguous statements followed by a third that clarifies what they mean "Hence resistivity of the metal will be smaller than the value in (b)"
So I say the direct opposite of what the mark scheme says. Please could anyone here give an opinion? Am I wrong and have just misread the question? Is the mark scheme wrong? Or, as several people in my department hold, I've got the Physics right but am reading the mark scheme wrong or that the mark scheme is poorly worded and ambiguous. I don't think that third statement is ambiguous, I think it makes a very definite statement.
Thanks for any help! :)
Elbow