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Can you please explain the significance of photoelectric effect?

The photoelectric effect is the emission/removal of electrons, normally, from the surface of a metal. This is done as light is shone on the metal. This is a very useful proof that light can act as a particle...
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Answered by Khawaja A. • Physics tutor
6343 Views

If x^2 + y^2 = 20 and y=10 - 2x, find x and y.

First work out y 2 using the second equation, making sure to do this using the FOIL technique. Then substitute this into the first equation to get 5x 2 - 40x - 80 = 0. All the terms in this can be divided by...
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Answered by Sara T. • Maths tutor
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Draw a graph on the effect of an increase in temperature on the rate of an enzyme controlled reaction. Explain the shape of the curve and suggest why the temperature of a mammal is maintained just below the optimum temperature.

As kinetic energy increases, enzyme and substrate molecules collide with more frequency allowing more enzyme substrate complexes to be formed. With increasing temperature, the tertiary structure of the prote...
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Answered by Sadia Z. • Biology tutor
7829 Views

How can I efficiently plan an essay in an exam?

It is always helpful to plan your essay before you begin. Planning is essential to have a clear, confident argument. Once you have selected your question, loosely annotate it - underlining key words (like th...
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Answered by Emily D. • English tutor
2253 Views

To what extent is (third degree) price discrimination beneficial to consumers and producers?

Third degree price discrimination refers to when a profit-maximising firm has two different prices for different demand groups, for example, a cinema would charge the student group less than what they charge...
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Answered by Acacia T. • Economics tutor
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