Which Joe gave his name to ‘sloppy joes’? We look at five interesting sandwiches and their lexical origins.
The spectrum of frequencies of electromagnetic radiation emitted or absorbed during transitions of electrons between energy levels within an atom. Each element has a characteristic spectrum by which it can be recognized.
- ‘He had been struggling to understand the details of atomic spectra.’
- ‘Each element has its own unique atomic spectrum.’
- ‘In 1913, Danish physicist Niels Bohr developed the first model of the atom that used the concepts of quantum theory to explain atomic spectra.’
- ‘Although the Bohr model adequately explained how atomic spectra worked, there were several problems that bothered physicists and chemists.’
- ‘Addition of this exclusion principle to the then current theory of atomic structure enabled many additional predictions to be made about atomic spectra and chemical combination.’
- ‘But then we wouldn't see the characteristic atomic spectra of the different elements - atoms would be able to produce light of any colour, which is not what we observe.’
We take a look at several popular, though confusing, punctuation marks.
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.