Question

A measurement of the circumference of a disk has an uncertainty of 1.5 mm. how many measurements must be made'

Answer 1

25 measurements need to be taken

Step-by-step explanation:

Given:

individual uncertainty,
`u_i=1.5\ mm`

• Let the uncertainty mean be
  `u_m=0.3\ mm`

Now we have the relation as:

`n=((u_i)/(u_m))^2`

where:

n= number of measurements

`n=((1.5)/(0.3))^2`

`n=25` measurements need to taken in this case.