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What is "half-life"?

Half-life is a term commonly used in radioactivity. It defines the time taken for a radioactive source to halve its activity. A radioactive source will emit radiation (energy) through the emission of particl...
ET
Answered by Evan T. • Physics tutor
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How do I evaluate a key study?

Evaluation for psychological studies can be done using the GRAVE method. That is firstly, G - generalisability, to what extent can the findings of this study be generalised to the general and target populati...
GD
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Examine one evolutionary explanation of behaviour.

A principle of evolutionary psychology is that as genes mutate, those that are advantageous are passed down through a process of natural selection. This is derived from Charles Darwin's theory of evolution, ...
ZK
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Cognitions, emotions and behaviours are products of the anatomy and physiology of our nervous and endocrine systems. There are biological correlates of behaviour.

Martinez & Kesner (1991) – An experiment to determine the role of neurotransmitter acetylcholine on memory formation (in hippocampus) of mazes on rats. Rats were trained to go through a maze and receive ...
ZK
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Behaviour can be innate because it is genetically based and can be inherited.

Heston (1966) – study whether schizophrenia is genetic or not with adopted children, assuming if there are any physical and behavioural similarities between offspring and parents, that is due to genetics. He...
ZK
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