Time of onset: In Jamaica, it begins one to 2 hours after death and takes further one to 2 hours to develop. In temperate countries, it begins in 3 to 6 hours and takes further 2 to 3 hours to develop. Duration of rigor mortis: In Jamaica, usually it lasts 18 to 24 hours in winter and 12 to 18 hours in summer.
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Electromagnetic induction produces an electromotive force across a conductor which is exposed to time varying magnetic fields.ccording to Faraday's law of induction, since the same magnetic flux passes through both the primary and secondary windings in an ideal transformer, a voltage is induced in each winding, according to eq. (1) in the secondary winding case, according to eq.
In an electromagnetic wave the motion of the electric and magnetic fields is transverse to the direction of propogation of the wave. So the E, B and k vectors are perpendicular to each other. Also unlike a mechanical wave, an electromagnetic wave does not require a medium to travel. It can travel in completely empty space. The matter wave or de Broglie wave comes from the wave particle duality of a quantum mechanical object such as an electron or an atom etc. This wave can also travel in empty space.