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Electrons are accelerated through a potential difference of 300 V. What is their final de Broglie wavelength?

The kinetic energy of the electron will be equal to the energy what the electric field gives to it.1/2 m v 2 =V QFrom thisv=sqrt(2 V Q/m) De Broglie wavelength:lambda=h/p=h/(mv) We know that h is the planck ...
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Answered by Csaba B. • Physics tutor
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Explain the impact that a fall in the world price of oil might have on aggregate supply and gross domestic product (GDP) in an economy.

The first key step to answering this type of IB Economics question is to define the key terms. Aggregate supply is defined as total amount of goods and services that producers of an economy are willing to su...
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Answered by Sofia D. • Economics tutor
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The circle c has equation x^2+ y ^2=1 . The line l has gradient 3 and intercepts the y axis at the point (0, 1). c and l intersect at two points. Find the co-ordinates of these points.

The equation for a line is y(x)=ax+b.Because it intersects the y axis at x=0 at y=1y(x)=b=1a is equal to the gradient of the function so the line is given as y(x)=3x+1In order to get the two intersections we...
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Calculate the pH of the following solutions: 0.002 mol/dm^-3 KOH

pH by definition is given as -log 10 (c H+ ) or log 10 (1/c H+ ), where c H+ is the concentration of the H+ ions in the solution.Similarly, pOH= -log 10 (c OH- ) pH + pOH= 14KOH is basic so we can calculate ...
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Answered by Csaba B. • Chemistry tutor
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Why does Romeo seem to love Rosaline and then very quickly love Juliet? (Romeo and Juliet, Shakespeare, play taught at GCSE)

This is a really good question that's answer is central to the the plot of Romeo and Juliet. I agree that it does seem surprising that after spending a great deal of the first four acts of the play exclaimin...
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Answered by Alice F. • English tutor
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