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Can you explain the photoelectric effect?

The photoelectric effect is one of the first pieces of experimental evidence of quantum mechanical phenomena. It describes how a material absorbs light and result in emission of electrons. Using a classical ...
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Answered by Anthony H. • Physics tutor
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Can you give an example of using the chain rule for differentiation? Example: Let y=(6 + 2x + 2x^2)^3, find dy/dx.

The chain rule is given by dy/dx= (dy/du)(du/dx). If we set u=6+2x+2x 2 then, y=u 3 thus, dy/dx=(3u 2 )(2+4x) = (3(6+2x+2x 2 ) 2 )(2+4x). Example does not ask to simplify expression or evaluate at any partic...
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Answered by Anthony H. • Maths tutor
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Explain what Fartlek Training is and give an advantage and disadvantage of this type of training.

Fartlek Training is a type of continuous training that involves varying speeds, inclines and terrains meaning intensity changes throughout the workout. It is used mainly by games players e.g. HockeyAn advant...
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Explain what is meant by a negative externality and give an example of a negative externality that arises from fuel consumption.

A negative externality is a spillover cost affecting a third party from an economic transaction.A negative externality that arises from fuel consumption is the air pollution affecting the health of the popul...
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Answered by Jessica B. • Economics tutor
4511 Views

Describe the movement of ions, and changes in potential, across the nerve cell membrane during depolarisation and repolarisation.

During depolarisation, sodium ions move into the cell, resulting in the membrane potential rising from -70 millivolts (mV) to +40mV.During repolarisation, potassium ions move out of the cell, and the membran...
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Answered by William P. • Biology tutor
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