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How do I draw a graph, y = mx + c, if I am only given m and a point that the line passes through?

Let's say we have the equation y = 2x + c and we are told that the line passes through the point (3, 4). Our first step is to use the numbers from the point (3, 4), by substituting them into our equation. Li...
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Answered by Alex D. • Maths tutor
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why does photoelectric emission occur only when there is a certain threshold frequency of incident radiation?

According to the particle theory of light, hf=φ+KEmax, so along with the minimum amount of energy required, there is a minimum frequency as well, φ= hf o . Thus, the incident photon must have a frequency hig...
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Answered by Nikolas P. • Physics tutor
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Calculate the pH of the solution formed when 30 cm3 of 0.150 moldm-3 aqueous sulfuric acid is added to 30 cm3 of 0.200 moldm-3 aqueous potassium hydroxide at 25 C.

H 2 SO 4 ---> 2H + + SO 4 2- KOH ---> OH - + K + Initial moles of Sulfuric acid: Volume x Concentration = Moles (30/1000) x 0.150 = 4.5x10 -3 mol Moles of H + made by sulfuric acid: It is a 1:2 ratio o...
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Answered by William D. • Chemistry tutor
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Compare the effect of imagery in any two poems by Seamus Heaney

Firstly, I would structure my essay in the style of compare and contrast , as this is what the examiners are ultimately looking for. Say I choose Death of a Naturalist and The Follower by Seamus Heaney. I’d ...
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How do I answer a source analysis question?

The first thing to remember when analysing a historical primary source is that it will always be of some value. Most primary source exam questions ask of a source's value, or of its use to a historian, and i...
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Answered by Sean H. • History tutor
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