Uncertainties

Question 1

How you calculate percentage uncertainty?

Answer 1

percentage uncertainty = ( absolute uncertainty (+/-) ) / ( measurement to which uncertainty is applied ) x 100

Question 2

When do random uncertainties occur?

Answer 2

When repeated measurements are made of the same quality, there is likely to be a spread rules.

Question 3

When do scale reading uncertainties occur?

Answer 3

A measuring instrument such as a metre stick can only be read with a certain degree of accuracy depending on the scale markings on it. The scale reading uncertainty is determined by the accuracy to which we can read the Cale.

Question 4

When do systematic uncertainties occur?

Answer 4

When there is a mistake in the way an experiment is carried out or an instrument is wrongly calibrated.

Question 5

how do you know which absolute uncertainty value to use in calculations?

Answer 5

Whichever one has the largest percentage. You can use this percentage to calculate the uncertainty of the number you calculate.