Top answers

Describe how emission spectra are formed and how they can be used to identify the elemental composition of a star.

Electrons are bound to a nucleus in quantised energy levels. As they gain and lose energy they transition between this energy levels by emitting photons. Emitted photons have energies equal to the change in ...
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Answered by George P. • Physics tutor
3234 Views

Consider Donald Trump chooses to raise import tariffs on Chinese Goods, what will be the impact on the US macroeconomic environment?

Firstly, it would be useful to look at some key definitions. An import tariff is a fee paid to bring goods from abroad into a country and be sold. Therefore, a rise in Chinese import tariffs raises the price...
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Answered by Hugh W. • Economics tutor
2496 Views

Describe what happens in a healthy person when the pancreas detects a rise in blood sugar level.

The pancreas responds by releasing insulin. This causes glucose to move into the cells.
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Answered by Alfie B. • Biology tutor
3729 Views

Explain how shivering helps to raise a persons body temperature.

Shivering involves rapid contracting and relaxing of the muscles. This requires energy and so the muscle cells respire in order to release this energy in the form of heat.
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Answered by Alfie B. • Biology tutor
5102 Views

Why did the Arab Conquests succeed?

The success of the Arab Conquests can be easily broken down into two factors: the strengths of Islam and the weaknesses of their enemies. This can be seen in the worn down attitudes of the Byzantine and Sasa...
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Answered by Megan M. • History tutor
17320 Views