Physics Facts I Forget Sometimes

Question 1

1 femtometre

Answer 1

10^-15 m

Question 2

Equation to find the % uncertainty in a gradient using error bars

Answer 2

% uncertainty = (Gmax - Gmin)/2 x 100

Question 3

Range in which the strong force is attractive

Answer 3

0.5 - 3fm

Question 4

Electron capture process

Answer 4

A proton-rich nucleus absorbs an orbital electron when there’s too little energy for B+ decay.

p + e- —> n + Ve

Question 5

What kind of light does mercury vapour release in a phosphorescent tube

Answer 5

Ultraviolet

Question 6

2 applications of polarisers

Answer 6

Sunglasses and television reception

Question 7

What are lift and drag force

Answer 7

Lift: perpendicular to motion of an object through a fluid
Drag: forces like friction and are resistance that oppose motion

Question 8

What is a thermistor

Answer 8

A component where resistance decreases when temperature increases

Question 9

Uses for semiconductors

Answer 9

Diodes and transistors

Question 10

Superconductor uses

Answer 10

MRI machines, maglev trains, particle accelerators

Question 11

Cells in series vs parallel (V)

Answer 11

Series: Vtotal = sum of Vs

Parallel: Vtotal = individual V

Question 12

What is the principle of superposition?

Answer 12

When two or more waves move with the same frequency arrive at a point the resultant displacement is the sum of the displacements of each wave