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The imperative mood is used when giving commands to a number of persons: either the 2nd person singular 'tu', the 1st ...

All that is meant by an 'excited' atom is that one or more of the atoms electrons in it's shells, are then excited into shells that are in higher energy states that they were in before.

F...

At short distances between the nucleons at roughly 3 femtometers or so, the strong nuclear force between two nucleons begins to overcome the electrostatic repulsion (if both or one nucleon is a proton)...

1. Fertilisers containing nitrogen are washed from fields to rivers and ponds. 2. This effectively fertilises the algae in the pond causing an 'algal bloom'. 3. The layer of algae on the surface stops ...

Definition

Innovation is the successful exploitation of new ideas. This is predominantly achieved through research and development (R&D). R&D is the necessary inves...