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Why do rays of light change direction as they pass from air to a glass block?

Light travels as waves which have a distinct set of properties: a speed, a frequency and a wavelength. These properties are related to each other through the following equation: speed = frequency * wavelengt...
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Answered by Lisa C. • Physics tutor
21486 Views

Define antibodies and antigens, and describe the different ways in which the body develops immunity.

Immunity is the capacity of the body to recognise the intrusion of disease-causing microorganisms (pathogens) and develop a response to fight infection. Antigens and antibodies are crucial to the process of ...
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Answered by Charlotte B. • Biology tutor
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What is Utilitarianism?

On a simple level, utilitarianism is the belief that the morally right thing to do in any situation is to maximise the greatest happiness for the greatest number of people. A good example of this idea in pra...
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Solving simultaneous questions, e.g. 3x + y = 11 and 2x + y = 8

The unknowns in a simultaneous equation need to be solved, which in this case are x and y.The method I will be using is by elimination:First, find which unknown has the same coefficient. In this example this...
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Answered by Simran S. • Maths tutor
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What is the pluperfect tense in German and how do I form it ?

The pluperfect tense describes things or events that had been true or had happened at one point in time before something else happened. The pluperfect tense has two parts to it: it is always formed with the ...
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Answered by Maya S. • German tutor
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