Question

1. In the measurement of refractive index of glass, the values obtained in different trails are 1.55, 1.56, 1.52, 1.54 and 1.53. Calculate the (i)actual value, (ii)absolute error, (iii) fractional error, (iv)percentage error.

Answer 1

Answer:

Please see explanation

Explanation:

The mean may be calculated by summing the values of the refractive index and dividing the sum by the number of experiments. This is:

Mean = (1.45 + 1.56 + 1.54 + 1.44 + 1.54 + 1.53)/6

Mean = 1.51

The mean absolute error is the sum of the absolute values of errors divided by the number of trials:

MAE = (|1.45-1.51|+|1.56-1.51|+|1.54-1.51|+|1.44-1.51|+|1.54-1.51|+|1.53-1.51|)/6

MAE = 0.043

The fractional error is the MAE divided by the actual value:

Fractional error = 0.043 / 1.51

Fractional error = 43/1510

The percentage error is the fractional error multiplied by 100:

Percentage error = 2.85%