Recent content by youmei0426

Since the two lenses are plano-concave and plano-convex, the lens maker equation can be simplified into containing only 1 R for each of the lens. Substituting the values for the red light, I got: 1/f1=0.51/R1 and 1/f2 = 0.64/R2. Adding these two equations and equating them to 1/(500*10-3)...

Ah since the impedance is equal to the resistance which is 1 Ohm in both cases, I wrote just I2 and (I1-I2) instead of I2*R and (I1-I2)*R. Sorry should have made that clearer!

Ah okay, I will just have to work through the very long equations to find the phase and real part then. Thanks!

My first idea was to find the total impedance of the circuit, but I think viewing the two parallel resistors as one resistor of 0.5 Ohm isn't the correct way? I don't know how to simply this series / parallel circuit further to find Z total. Then I tried to use Kirchhoff's law to the loop on...

I know how the answer is C, since E=F/q and F=ma=mg. However, I am a bit confused as to why my other method doesn't work. I thought that since the droplets are falling at a constant velocity, there is not net force, so according to E=F/q the electric field must be zero then? This seems like a...

Aah i see now, thanks a lot!

This is my working out, and I also included the correct answer in the last line. The answer used a different method, however, what did I do wrong with my method? Thanks for the help!

Oh I think I understand it now! I just need to draw the line of best fit and find the gradient of that line. Thanks!

I meant how to convert the known [H+] concentration to the [I2] concentration given to me by the graph. Because I need to know the time it takes for the hydrogen to reach the 0.15 mol/L concentration right?

Homework Statement Homework EquationsThe Attempt at a Solution I need to know the time it takes for the [H+] concentration to be 0.15mol/L. However, the graph gives me the [I2] concentration over time, and I don't know how to convert it to the [H+] concentration. How should I solve the...

Homework Statement the question asks for the concentration of ethanoic acid, therefore I need to find out the volume of ethanoic acid used during the titrations. I thought it would be 30mL because that's when the temperature reaches maximum. But the answer says that the volume should be in the...

Homework Statement Homework Equations - The Attempt at a Solution I know that the equilibrium will shift to the side with fewer moles of molecules when the pressure is increased according to le Chatelier's principle, so I thought in this case it would shift to the left as there is only 1...

Homework Statement Homework Equations F=ma=mv/t[/B] The Attempt at a Solution I used the equation F=mv/t, in which I find the change in velocity and change in time before and after the collision. The change in time is t2-t1, but the problem comes when I am calculating the change in...

I came across another similar problem regarding diffraction grating, and there the diffraction angle is from the normal to the first maximum. So I am a bit confused as to what exactly is the angle in the formula? Thanks!

thanks a lot!