
A physical quantity is described by the relation . If the relative errors in the measurement of and respectively and , then the relative error in will be:
A.
B.
C.
D.
Answer
139.5k+ views
Hint Calculate the relative error by multiplying the powers of each of the variables with their percentage errors and adding their individual values.
Complete step by step answer
Percent error is calculated by dividing the difference between measured and known value with the known value, multiplied by
Relative error is connected with the notion of correct significant digits or correct significant figures. The significant digits in a number are the first nonzero digit and all succeeding digits.
It gives us an idea about the size of the error in a particular physical quantity. The relative error does not have a unit because it is a ratio of the same physical quantity. Since it is a proportion, so we can express it as a percentage by multiplying the relative error by
On the other hand absolute error is just the difference between the measured value and the true value unlike the relative error which is a ratio. So the absolute error has a unit.
The relative error in is given as
Therefore the relative error in is
So, the correct answer is D.
Note Relative error has two features- Its value becomes undefined when the true value of the variable is zero.
-Relative error is only applicable when measured on a ratio scale.
Complete step by step answer
Percent error is calculated by dividing the difference between measured and known value with the known value, multiplied by
Relative error is connected with the notion of correct significant digits or correct significant figures. The significant digits in a number are the first nonzero digit and all succeeding digits.
It gives us an idea about the size of the error in a particular physical quantity. The relative error does not have a unit because it is a ratio of the same physical quantity. Since it is a proportion, so we can express it as a percentage by multiplying the relative error by
On the other hand absolute error is just the difference between the measured value and the true value unlike the relative error which is a ratio. So the absolute error has a unit.
The relative error in
Therefore the relative error in
So, the correct answer is D.
Note Relative error has two features- Its value becomes undefined when the true value of the variable is zero.
-Relative error is only applicable when measured on a ratio scale.
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