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Describe the workings behind the Photoelectric effect

In any metal, there are free surface electrons. For these electrons to escape from the surface of a metal, they require a specific amount of energy, called the 'Work Function'. There are many sources of this...
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Answered by Toby R. • Physics tutor
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Explain how a stationary wave is produced when a string fixed at both ends is plucked

When the string is plucked, waves will travel from the point where it was plucked to the fixed ends, which cannot move and so must be nodes. The waves will reflect, and the superposition of the reflected and...
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Answered by James T. • Physics tutor
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Solve the simultaneous equations for x and y: 9x-2y=7 4x-2y=2

Using the elimination technique:As we have -2y in both equations we can take the equations away from each other in order to eliminate -2y and create a new linear equation involving only x. this equation woul...
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Answered by Mira P. • Maths tutor
4893 Views

Explain the process of muscle contraction

Nerve impulses travel along the muscle fibre membrane ( sarcolemma ). The impulse is carried down into the fibre through T-tubules . Impulses are spread along the sarcoplasmic reticulum membrane causing calc...
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Answered by Akash K. • Biology tutor
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I looked at AQA higher tier roleplay 15 June 2018

General tips before we begin ! means you have to respond to something you haven't seen before and ? means you need to ask a questiontú? Is allowed for questionSelf correction, ask puedes repetirlo, ask a que...
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Answered by Clare B. • Spanish tutor
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