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What is the photoelectric effect and how does it provide evidence for the quantisation of electromagnetic radiation?

(Many students have an intuitive understanding of the photoelectric effect and how it demonstrates quantisation, but it is important when preparing for an exam to be able to explain this clearly and precisel...
RP
Answered by Rohit P. • Physics tutor
2224 Views

Explain the concept of bandwidth with regard to a real op-amp and how this differs from the ideal op-amp.

Ideal op-amps are considered to have infinite open loop gain at any frequency, meaning that in a feedback circuit the output voltage will always be as large as it needs to be to bring the potential differenc...
AL
2868 Views

Would Human Rights survive in the UK if the Human Rights Act 1998 were to be repealed by Parliament?

This question requires one to consider how far civil liberties (the common law or ‘residual’ rights of private citizens) protect human rights in the UK and whether the HRA is necessary in upholding these rig...
JM
Answered by Jacob M. • Law tutor
1948 Views

Let C : x^2-4x+2k be a parabola, with vertex m. By taking derivatives or otherwise discuss, as k varies, the coordinates of m and, accordingly, the number of solutions of the equation x^2-4x+2k=0. Illustrate your work with graphs

Write y=x 2 -4x+2k. And m:= (x m , y m ) for the coordinates of our vertex. We deduce that x m is exactly the value of x for which y'=2x-4=0, because m is a minimum point of y. By solving y'=0, we get x=2=x ...
MV
3672 Views

When should I use the subjunctive?

The subjunctive in French is a special verb form (called a mood) which is used to express doubt or uncertainty, for example following phrases such as 'je ne pense pas que', 'je doute que', 'je ne crois pas q...
CM
2106 Views