Category: Physics

Anatomy of a wave 0

Anatomy of a wave

A wave is a vibration or oscillation that travels through space and transfers energy It transfers energy from one place to another, but it does not transfer matter Matter oscillates, with no net displacement...

Magnetic force on a charge 0

Magnetic force on a charge

If a positive charge is moving through a magnetic field, the force on that charge is given by F = qvB The direction of the force is given by the right hand rule. Note...

Electric charge 0

Electric charge

Charge is a physical property of matter Both positive and negative charge exists When two bodies with a net electrical charge come together, they experience a force The SI unit for charge is the...

Fluorescence and phosphorescence 0

Fluorescence and phosphorescence

When an electron absorbs a high energy photon, excitation can occur across several energy levels On de-excitation, the atomic electron makes several smaller steps back to ground state Hence, these steps result in the...

X-rays 0

X-rays

Production: A heated cathode produces electrons These electrons are accelerated by a high voltage towards a metal target Upon collision, these electrons are decelerated and hence emit EMR in the form of x-rays AKA...

Photoelectric effect 0

Photoelectric effect

1887 – Heinrich Hertz discovered when light of a certain frequency on a metallic surface, electrons are emitted If the light does not have a high enough frequency, no electrons are emitted no matter...

Energy levels and spectra 0

Energy levels and spectra

Bohr’s model of an atom Atoms consist of a positive nucleus surrounded by electrons The electrons can only exist in specific energy levels; there no levels in between When a photon at the correct...

Electromagnetic radiation 0

Electromagnetic radiation

A form of energy emitted and absorbed by accelerating charge EMR has both electric and magnetic field components, which are perpendicular to each other and to the direction of propagation EMR is self-propagating and...

Cosmology 0

Cosmology

Astronomical distances Astronomical distance (AU) is the average distance from the Earth to the Sun. A light year is the distance light travels in one year. = 9.46 * 1015 m A parsec =...

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