Tagged: waves

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...

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...

Resonance and standing waves 0

Resonance and standing waves

Forced oscillation Produced when an external periodic driving force vibrates a system The system will vibrate at the same frequency as the applied force The system will continue to vibrate as force is applied...

Superposition and interference 0

Superposition and interference

Superposition Principle of superposition: when two or more waves meet at a point, the resultant displacement is the sum of the displacements of the individual waves. A wave can be represented by a series...

Refraction and diffraction 0

Refraction and diffraction

Refraction In 3AB, only qualitatively. Quantitatively is out of the syllabus. Refraction is the bending of a wave when it enters a medium with a different wave speed When light moves from a fast...

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