# Welcome, all School Scientists!

If you are studying or teaching science in high school, this is the site for you. On this site, we help you prepare for tests and examinations at all high school levels.

The course materials and questions have been prepared by professional teachers with many years of experience in the classroom. We would be happy to hear from you if you have any problems using the site, have any questions, or have any suggestions.

You are welcome to browse around and make use of the material. There is no registration or log-in, and it is all entirely free of charge.

## Physics

Core material for all high school levels of physics. We have 4 different types of quizzes, including multiple choice, worked answers, and exam practice.

There are also labs, tutorials, and lots of hints and ideas to help you study better.

The first level (years 9 and 10) material is complete, and we are working on the advanced material. Enjoy your Physics on SchoolScientist.com!

## Mathematics

There is a full set of mathematics materials for all high school levels.

Along with formative questions, helping you learn, there is a full set of past examination paper questions, with full worked answers, to help you prepare for that big day!

#### Quote of the day...

An unsophisticated forecaster uses statistics as a drunken man uses lamp-posts - for support rather than for illumination.

#### Giga

[ Physics : Units and Measures]

Read more#### Giga

S.I. prefix = $10^{9}$

The symbol for giga: G

e.g. 1 gigawatt = 1 GW = $1 x 10^{9} W$

#### Composite Function

[ Mathematics : Algebra and Functions]

The composition of two functions, g and h, such that g is applied first and h second, is given by:

(g ^{o} h)(x) = g(h(x))

#### Precision

[ Mathematics : Numbers and Geometry]

Precision refers to how close repeated measurements are to the mean of the set of measurements.

#### Population Growth

[ Mathematics : Logarithms and Exponents]

Populations of every type follow an exponential growth function.

#### Empirical

[ Physics : Waves and Oscillations]

Empirical science is the method by which hypotheses are tested by experimental investigation.

#### Archimedes' Palimpsest

[ Physics : Units and Measures]

Long lost animal-skin parchment written by Archimedes in the third century BCE, containing clues to the very advanced understanding this ancient Greek mathematician had of subjects like limits.

#### MKS

[ Physics : Units and Measures]

metre-kilogram-second base units under the SI system of units

#### Wien Displacement Law

[ Physics : Waves and Oscillations]

Wien Displacement Law: the wavelength $λ_0$ and surface temperature $T$ of a black-body is related by:
$λ_0T = 2.90 × 10^{-3}$ K m.

#### Binding Energy

[ Physics : Nuclear and Particle Physics]

The energy that is needed to hold the nucleons of an atom together.

#### Area Of A Triangle

[ Mathematics : Numbers and Geometry]

The area of a triangle is $A = ½h⋅b$, where $h$ is the vertical height and $b$ the length of the base.

#### Focal Length

[ Physics : Light and Optics]

The distance from a mirror or lens to its focal point.

#### Rippletank

[ Physics : Waves and Oscillations]

An instrument for studying waves.

#### Implicit

[ Mathematics : Differential and Integral Calculus]

[Mathematics] An implicit function is one in which $y$ is defined explicitly in terms of $x$.

#### TCE

[ Physics : Units and Measures]

The amount of energy in one tonne of coal: 29.308 GJ

#### Longitudinal

[ Physics : Waves and Oscillations]

In the direction of the long axis, or motion in the case of waves.

#### Geostationary

[ Physics : Mechanics]

Geostationary satellites are synchronised with the rotation of the Earth, making the period of their orbit the length of an Earth day, 24 hours.

#### Vector Art

[ Mathematics : Vectors and Trigonometry]

Vector art, or vector graphics, is a way of drawing and colouring images with computers. All the points, lines, curves and shapes (polygons) are described by mathematical expressions.

#### Complex Number

[ Mathematics : Complex Numbers and Series]

[Mathematics] Complex numbers contain an imaginary part and a real part, of the form $a + bi$, where $i$ is $√{-1}$, which has no solution (or meaning) in the real realm.

#### Michelson-Morley Experiment

[ Physics : Light and Optics]

The Michelson-Morley experiment was a very significant 'negative result'. The purpose of the experiment was to measure the change in speed of light in different directions through the presumed universal ether. Instead of finding this, the experiment demonstrated instead that the ether does not exist.

#### Convection

[ Physics : Energy]

Exchange of matter and/or energy resulting from a heat gradient

#### Quadratic Solution

[ Mathematics : Vectors and Trigonometry]

If $ax^2+bx+c=0$ with $a≠0$, then: $$x={-b±√{b^2-4ac}}/{2a}$$