Flashcards in Working as a physicist Deck (20):

1

## Femto

### x10 ^-15

2

## Pico

### x10 ^-12

3

## Nano

### x10 ^-9

4

## Micro

### x10 ^-6

5

## Milli

### x10 ^-3

6

## Kilo

### x10 ^3

7

## Mega

### x10 ^6

8

## Giga

### x10 ^9

9

## Tera

### x10 ^12

10

## What is uncertainty?

### The interval in which the true value lies/the range of possible values

11

## What is the error in a result?

### The difference between the measured value and the true value

12

## What is % uncertainty?

### The uncertainty calculated as a percentage of the measured value

13

## What is resolution?

### The smallest measuring interval in a single reading. Resolution can give the uncertainty, but for instruments such as a stopwatch, human reaction time also contributes to uncertainty, so resolution cannot give uncertainty

14

## What is the range?

### The largest value minus the smallest value (in repeated readings)

15

## What is precision?

### Indicates the consistency between repeated values

16

## Why is it better to measure larger values?

### A larger value will give a much smaller percentage uncertainty, assuming the uncertainty is fixed

17

## How should you estimate the uncertainty for a single measurement?

### Given by half the smallest increment on the device. However, for instruments such as a ruler, the increment is the uncertainty, as 2 measurements are made.

18

## How should you estimate the uncertainty for repeated readings?

### Uncertainty is half the range, and % uncertainty is half range divided by mean

19

## For calculated values, how should you combine uncertainties?

### Add the % uncertainties (generally while multiplying or dividing results)

20