Devices for lighting a room switch power to a particular pathway: the heating by radiation pathway. If the source emits at...

Physics Narrative 14-16

In lighting, energy arrives tiny shot by tiny shot. Typically the pathway fills a thermal store. Energy can be modelled by an...

Physics Narrative 14-16

There is a perplexing thing about photons that follows directly from these same photons being something used to model lighting...

Physics Narrative 14-16

The frequency of the light associated with each photon sets the energy shifted by each photon.

Physics Narrative 14-16

The frequency of a visible photon is measured in terahertz ( 400–700 terahertz ). The energy of such photons is measured in...

Physics Narrative 14-16

Photons are all-or-nothing entities: you cannot emit or absorb half a photon. (Remember that to detect a photon you have to...

Physics Narrative 14-16

The power switched to the heating by radiation pathway is set by the energy of each photon and the number of photons emitted...

Physics Narrative 14-16

Lighting and other electromagnetic radiating are emitted and absorbed in discrete chunks. Describing lighting as myriad...

Physics Narrative 14-16