Estimations & Uncertainties Flashcards
Estimate the Speed of Sound in Solids
1500ms-2
Estimate the Speed of Sound in Liquids
750ms-2
Estimate the Speed of Sound in Air
330ms-2
Estimate the Speed of Light in a Vacuum
3.0x10^8ms-2
Estimate the Density of Water in kgm-3
1000kgm-3
Estimate the Density of Air in kgm-3
1kgm-3
Estimate the Mass of a Female Athlete
60kg
Estimate the Mass of a Male Athlete
80kg
Estimate the Mass of an Apple
30g
Estimate the Mass of a Protractor
10g
Estimate the Mass of a 30cm Ruler
30g
Estimate the Speed of a Male Athlete 100m
10ms-1
Estimate the Kinetic Energy of a Male Athlete 100m
4000J
Estimate the Rate of a Power Saver Bulb
20W
Estimate the Volume of a Human Head
3050 - 3060cm3
Estimate the Volume of an Average Adult Male
0.14m3
Estimate the Wavelength of White Light
460nm
Estimate the Wavelength of Red Light
700nm
What are the 2 types of Uncertainties
Random and Systematic Uncertainties
What are Random Uncertainties
Results scattered about the true value.
What causes Random Uncertainties
- Not following precautions
- Misreading values
How to Reduce Random Uncertainties
- Take repeated readings of same quantity
- Repeat experimental procedures over a range of values
- Draw a line of best fit
- Use a more precise instrument
- Repeat procedure to obtain a more precise value
What are Systematic Uncertainties
Results obtained that shift away from the true value
What causes Systematic Uncertainties
A fault in a system
