Paper 3a Flashcards
How to ensure that measurements from a micrometer are not affected by systematic error?
- Close jaws using ratchet
- Confirm that instrument reads zero
What is the horizontal/vertical bar in the middle of an oscilloscope called?
central horizontal/vertical graduation
If emf increases, what settings on oscilloscope should be changed?
Adjust Y-voltage gain to a less sensitive setting, to increase the number of volts/div
Explain where you should put a fiducial marker in a pendulum setup
Below the bob’s equilibrium position, as this is where the bob moves the fastest, so this is where the transit time is least
If log y varies linearly with log x, what is the relationship between x and y?
- They are linked by the power law
- ( y∝xⁿ )
How should you read the volume in a measuring cylinder?
By reading from the bottom of the meniscus at eye level
Uncertainty in reading
± half the smallest division
Uncertainty in measurement
±1 smallest division
Uncertainty in digital reading
± the last significant digit
How to reduce uncertainty in measuring a length?
- Fix one end of ruler
- As only the uncertainty in one reading is included
What is the rule for significant figures when taking logarithms?
num. of significant figures in data → num. of decimal places in log
Axis title for ln(x) where x is in cm
ln( x/cm )
Axis title for x² where x is in cm
(x/cm)²
Biggest thing you can measure in micrometer
50mm
What to use to measure a 10mm diameter hole
Vernier callipers
(micrometers only measured outside diameters)
