Recent content by zehkari

  1. zehkari

    Find the position of a proton in an E and B field

    Hey, I think I have the correct method now: As, $$z = \frac{1}{2}\frac{Eq}{m}t^2$$ And the time would be the same as one pitch (T), then, $$z = \frac{1}{2}\frac{Eq}{m}T^2$$ With substituion, $$z = \frac{1}{2}\frac{Eq}{m}{(\frac{2m\pi}{bq})}^2$$ For part (c), 3 revolutions would be...
  2. zehkari

    Find the position of a proton in an E and B field

    Yeah, sorry didn't double check. Question (b) asks to find the position of the proton along the z direction. Does this mean at ##t = 0##? If so the equations found for velocity and accerlation on the z plane do not work? As I can't think of a way to avoid having both unkown variables of time...
  3. zehkari

    Find the position of a proton in an E and B field

    The motion of the proton in the z direction would be due to the electric field applying a linear acceleration? So you could say the velocity in the z direction is: $$v_z = u_z + at$$ So, $$v_z = at $$ But as ##a = \frac{Eq}{m}##, then, $$v_z = \frac{Eq}{m}t$$ Displacement could be found...
  4. zehkari

    Find the position of a proton in an E and B field

    Hello all, I have a question with the helix path of proton in a magnetic field that I am a bit stuck on. Question: Equations: F = qv X B F = mv^2/r d=vt My Attempt: Think the graph drawn is good enough for questions (a). However, I am stuck on (b) and (c). Firstly I am not entirely sure...
  5. zehkari

    Relativistic momentum of two photons from a decay

    Hello, Thanks for replying. In the pi meson frame then distribution of momentum would be 1/2 for each photon. Does this imply the energy of one of the photons in the lab reference frame would be E' = γE ? And then with de Broglie's wave-particle duality: λ = h / p , so, λ = hc/E for each...
  6. zehkari

    Relativistic momentum of two photons from a decay

    Homework Statement Homework Equations (1) E2 = p2c2 + m02c4 (2) E = γm0c2 (3) E = Eγ1 - Eγ2 (4) p = E / c (5) E = hf (6) λ = c / f The Attempt at a Solution a) Using eqn (1), rearranged p = (E - m0c2) / c , I obtained 2.9 MeV c-1. Not sure if I have the right answer here as I...
  7. zehkari

    Error Calculation for a Diffraction Grating's Performance

    Yeah, the error in angle measurements is quite small. I think I will stick with sum of uncertainty in quadrature like you suggested and then talk it over with my lecturer. Thank you for your help.
  8. zehkari

    Error Calculation for a Diffraction Grating's Performance

    Hey, thanks, do you know of the weighted standard diviation? Does that apply here?
  9. zehkari

    Error Calculation for a Diffraction Grating's Performance

    Homework Statement I need to calculate the error of an average value (N for diffraction grating). My results were 4 different average angles. With which I calculated their uncertainty using std. Using equation (1), I found the number of lines per meter (N) with a known wavelength (λ) and the...
  10. zehkari

    How to Find y in a Double Slit Experiment Without Intensity Values?

    From question a) and using eqn (1) I obtained an answer in degrees and then converted to radian. I am assuming then that Φ has to be in radian? Then as eqn (3) is derived from eqn (1), the calculator should be in radian? Thanks again.
  11. zehkari

    How to Find y in a Double Slit Experiment Without Intensity Values?

    Hey, There are different values for degrees and radian. Radian gives 3.2 * 10-4. Which is more realistic for distance between slits. I never thought about radian or degree for inverse. I assumed either was ok. Could you explain why you have to use radian here for inverse cosine? Many thanks.
  12. zehkari

    How to Find y in a Double Slit Experiment Without Intensity Values?

    Ah, thank you yeah. So, Using eqn (3), y = λ*R*cos-1(sqrt (I/I0)) / π*d Which with I/I0 = 1/2 , I get 18 mm for y. If that looks alright, thanks again for your help BvU.
  13. zehkari

    How to Find y in a Double Slit Experiment Without Intensity Values?

    Homework Statement Homework Equations (1) Φ = 2π*(dsinθ/λ) (2) Itotal = I0 cos2(Φ/2) (3) Itotal = I0 cos2(πdy/λR) λ = 585 * 10-9 m R = 0.700 m d = 0.320 * 10-3 m y = ? The Attempt at a Solution a) I used eqn (1) and divided the total oscillations by a complete oscillation to find the...
  14. zehkari

    What is the minimum force at this angle that will move the box?

    I think its good now. As the numerator is divided by cos(θ), you get sec(θ). Then as the denominator is divided by cos(θ), you get 1-μ.tan(θ). Thank you for your help. Thank you, yes I have it as greater than now.
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