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Describe and explain how an action potential is generated

This is a common question, that takes a little while to get your head around. Once you've understood the process, it can be simplified down to a cycle of 3 steps for memory: depolarisation , repolarisation a...
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Answered by Diluxshan S. • Biology tutor
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Two functions, y1 & y2, are given by y1=x^2+16x+4; y2=2(3x+2). Find analytically the volume of the solid created by revolving the area between the two curves by 2pi radians around the x-axis. N.B. y2>y1 on the interval between the points of intersection.

Setting the two equations equal to one another to find the intersection boundaries:x^2+16x+4=6x+4; x^2+16x+4-6x-4=0; x^2+10x=0;x(x+10)=0; x=0, x=-10. Setting up the volume of revolution (N.B. Due to typing r...
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Answered by Filippos G. • Maths tutor
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How does Shakespeare present Lear's daughters in Act One, Scene One?

From its outset, Shakespeare’s ‘King Lear’ challenges the fundamental qualities of human relationships and connections that are traditionally thought to be stable. In particular, it is the institution of the...
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Answered by Millicent G. • English tutor
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Find exact solution to 2ln(2x+1) - 10 =0

Isolate the 'ln term' 2ln(2x+1) = 10ln(2x+1) = 5 Take to the exponential power form e^(ln(2x+1)) = e^52x+1 = e^5 Simplify 2x = e^5 -1x = (e^5-1)/2
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Answered by Johnny D. • Maths tutor
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In the photoelectric effect, what happens as you increase the frequency of light keeping the same intensity constant?

E=hf, so as you increase the frequency of light, the energy of each photon hitting the metal surface is greater. Thus the electrons liberated from the surface of the metal have a greater maximum kinetic ener...
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Answered by Alexander J. • Physics tutor
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