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How does the photoelectric effect actually show that light is made up of particles?

The photoelectric effect is the observation that when light of a certain frequency or higher is shone onto a particular metal surface, electrons are emitted from the metals surface. Let's consider a device k...
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Answered by Robert M. • Physics tutor
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'From 1894 to 1914 the authority of the Tsardom remained essentially unchanged.'

It is without a shadow of doubt that the authority of the Tsardom did not remain “essentially unchanged”. Whilst throughout the regime of Alexander III Tsarist authority remained relatively strong, it is cle...
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Answered by Oliver K. • History tutor
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How do phospholipids form membranes?

Phospholipids are a major component of cell membranes. They are ideal components of membranes due to their structure. They consist of a glycerol and phosphate 'head' attached to two fatty acid 'tails'. The t...
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Answered by Lauren E. • Biology tutor
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What is the role of insulin in the body?

Insulin is a hormone released by the pancreas in response to high glucose levels in the blood. It primarily acts to reduce blood glucose levels. It does this by signalling muscle and fat cells to take in glu...
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Answered by Sophie B. • Biology tutor
6447 Views

What is the difference between porqué, porque, por qué and por que?

Students often confuse these four words due to their ortographical similarity, however it is fundamental that you can recognise the difference in order to correct include them in your written work. Por qué ,...
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Answered by Charlotte D. • Spanish tutor
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