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Find the 12th term and the sum of the first 9 terms on the following Arithmetic Progression: a = 2 and d = 3

12th term = a + (12 - 1)*d = 2 + 11(3) = 35 Sum (9) = 9/2 [2(2) + (9 - 1)*3] = 9/2 [28] = 252/2 = 126
ER
Answered by Elijah R. • Maths tutor
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The energy of a photon is 1.5MeV. Calculate the frequency associated with this photon energy and state an appropriate unit in your answer.

E=1.5MeV = (1.5x10^6)(1.6x10^-19)J = 2.4x10^-13J E=hf, f=E/h = (2.4x10^-13)/(6.63x10^-34)=3.6x10^20Hz
TD
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How do you do well on the paper 1 and paper 2 English literature A-level exam?

In order to do well in the exam, the first thing is to figure out the AOs, or the Assessment Objectives required in each question of your paper. Many students make the mistake of not remembering the AOs requ...
RB
Answered by Rebecca B. • English tutor
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A metal detector consists of a battery providing an alternating current to a transmitter coil and a receiver coil connected to a loudspeaker. Using Faraday's Law of Induction explain how a metal detector works. (5 marks)

The alternating current flows through the transmitted coil and produces a magnetic field around the coil. (1 mark) When the detector passes over a magnetic object, the magnetic field passes through the objec...
MH
Answered by Mabast H. • Physics tutor
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Explain how the human eye has both high sensitivity and high acuity.

The human eye has high sensitivity because many rods connect to a singular neurone, so many weak generator potentials combine to reach the threshold and trigger an action potential. The human eye has a high ...
AM
Answered by Anna M. • Biology tutor
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