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Isotope
Atoms of the same element (same atomic number) that have differe...Read more

Isotope

Atoms of the same element (same atomic number) that have different numbers of neutrons, and therefore different mass numbers....Read more
19
Nov
2025
Ion
A charged particle formed when an atom or molecule gains or lose...Read more

Ion

A charged particle formed when an atom or molecule gains or loses electrons....Read more
19
Nov
Element
A substance that cannot be broken down into simpler substances b...Read more

Element

A substance that cannot be broken down into simpler substances by chemical means....Read more
19
Nov
Cathode Ray
A beam of electrons emitted from the cathode (negative electrode...Read more

Cathode Ray

A beam of electrons emitted from the cathode (negative electrode) in a vacuum tube....Read more
19
Nov
Atomic Structure
Atoms have a nucleus of protons and neutrons, surrounded by a cl...Read more

Atomic Structure

Atoms have a nucleus of protons and neutrons, surrounded by a cloud of electrons....Read more
19
Nov
Lower Secondary Checkpoint Past Papers Year 9 pdf
Browse Cambridge Lower Secondary Checkpoint past papers Year 9 i...Read more

Lower Secondary Checkpoint Past Papers Year 9 pdf

Browse Cambridge Lower Secondary Checkpoint past papers Year 9 in 2020/2021/2022/2023/2024/2025 with answers pdf. Checkpoint past papers for S...Read more
19
Nov
Hubble's Law
The observation in physical cosmology that the velocity at which...Read more

Hubble's Law

The observation in physical cosmology that the velocity at which a galaxy is receding from the observer is proportional to its distance....Read more
17
Nov
Redshift
The observed increase in the wavelength (and decrease in frequen...Read more

Redshift

The observed increase in the wavelength (and decrease in frequency) of light from distant galaxies....Read more
16
Nov
Expanding Universe
The observation that the space between galaxies is increasing wi...Read more

Expanding Universe

The observation that the space between galaxies is increasing with time....Read more
16
Nov
Stellar Radius
The radius of a star. It can be estimated if the star's luminosi...Read more

Stellar Radius

The radius of a star. It can be estimated if the star's luminosity and its surface temperature (found from its spectrum) are known....Read more
16
Nov
Standard Candle
Is an astronomical object with a known luminosity, used to measu...Read more

Standard Candle

Is an astronomical object with a known luminosity, used to measure vast cosmic distances....Read more
16
Nov
Radiant Flux Intensity
The power received from a star per unit area at a distance from ...Read more

Radiant Flux Intensity

The power received from a star per unit area at a distance from the star....Read more
16
Nov
Luminosity
The total power output of a star, measured in watts (W)....Read more

Luminosity

The total power output of a star, measured in watts (W)....Read more
16
Nov
Cosmology
The branch of astronomy that deals with the origin, evolution, a...Read more

Cosmology

The branch of astronomy that deals with the origin, evolution, and large-scale structure of the universe....Read more
16
Nov
Astronomy
Astronomy explores the universe, from planets and stars to galax...Read more

Astronomy

Astronomy explores the universe, from planets and stars to galaxies and cosmic phenomena....Read more
16
Nov

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