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Explain the photo-electric effect and how the particle theory of light explains the phenomena. State the equation used to the determine the kinetic energy of a photo-electron and explain the origin of the terms used in your equation.

The photoelectric effect is the stimulated emission of electrons due to the irradiation of photons onto the surface of a metal. The increase in the frequency of the photons doesn’t lead to an increase in the...
JG
Answered by Joseph G. • Physics tutor
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What does the term comparative advantage mean? How can I use this in an essay based question?

A country has a comparative advantage in something if it can produce it at a lower opportunity cost than any other country. If for example Mexico were able to source and put together the components of a prin...
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Answered by Adam S. • Economics tutor
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Describe the main functions of political parties in the UK today.

We must first identify precisely what the question is asking of us. This is an example of a "Describe..." question, which for A-Level Politics does not require analysis as much as explanation. I su...
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Answered by Jay S. • Politics tutor
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Describe the similarities and differences in form between DNA and RNA

DNA and RNA have many similarities. They are both formed of a backbone made from sugar and phosphate groups, however DNA is formed of the sugar deoxyribose, and RNA is formed of ribose sugars. Attached to th...
KB
Answered by Kristel B. • Biology tutor
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What is the significance of using 'if and only if' in Philosophy instead of simply 'if'?

Often in Philosophy (and Maths) we may come across the phrase 'if and only if', regularly abbreviated as 'iff' and denoted by an arrow pointing in both directions. <-> Logicians refer to this as a bi-c...
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