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Physics Y12 EOY
Physics Summer Y12
| Question | Answer |
|---|---|
| Same weight hung from 2 springs but we don't know their spring constants | Use the E = 0.5 F x equation instead of the kx^2 one - gives different proportionality |
| 1ma of total 3ma Current leaving point in circuit just before resistor of 3000 ohms | Use K1L. The 3000 ohms must be half as much resistance as where the 1ma is going |
| Question about increasing precision when measuring diameter | Repeats increase accuracy not precision according to the 2016 markscheme, but should still always reference just in case (like the 2017 markscheme). Instead mention vernier callipers and high res - resolution affects precision |
| Read the question daniel | 'Other than normal contact force' come on |
| 'In this resistor there are X free electrons' when working out drift velocity | Have to work out the number density using object volume |
| Watch out cm vs m | Obviously |
| Diode shape - describe and justify | The flat is infinite resistance The curve is quickly decreasing res The straight line is slowly *decreasing* res Justify here is just show R = 2.0/0 = infinite, or could justify the other ones with 2 different points calculated |
| Issues with LED setup | Check if correctly oriented - 'the LED is reverse biased'. Make sure power supply high enough - must be GREATER than 2.6 (strike point) - not equal to. Check for all the issues - multiple could exist |
| (When two or more waves meet at a point) the resultant displacement is equal to the sum of the displacements of the (individual) waves | (When two or more waves meet at a point) the resultant displacement is equal to the sum of the displacements of the (individual) waves |
| Ball affected by air resistance flight path (shot diagonally up) compared to affected by air resistance. | Air resistant one always below path of the other one - the air resistance is upwards too |
| To show different resistances in potential divider circuit | Use the equations sheet |
| Stretching wire for breaking stress experiment | Safety goggles. Measure incremental mass increases. Calculate weight, cross-sectional area. |
| 'Explain' | |
| Multiple choice Q about momentum of ball | Check to see if the answer you choose is talking about the ball or stick |
| When can use P = IV for power loss | When the component is only doing power loss (e.g. filament lamp) and is the only component in the circuit (or in only branch of circuit) so you can assume all the p.d. is going to the power loss |
| Talking about velocity of displacement time graph | Have to mention gradient Dont just say stop point of each section - say 'between 0.2s and 0.8s' |
| Ideal voltmeter | Very large resistance |
| Explaining effect of increasing R on current | State I proportional to 1/R |
| Explaining potential divider circuit (with the other resistor being internal r) with R increasing in terms of current | Talk about how total R reduces total current, then explanation of V increasing in terms of V + Ir = E (lost volts decreasing) |
| Explain why the intensity of the wave changes as the distance x increases. | (As the wave spreads out the) amplitude decreases intensity proportional to amplitude2 and therefore intensity decreases |
| Explain what is meant by interference. | The superposition of coherent waves |
| Describe and explain changes in wavelength | State the wavelengths in terms of L if needed |
| Threshold frequency | Of the photons/EM waves |
| Use Einstein’s photoelectric equation to show phi = hf0 | hf = phi + KE(max) and kinetic energy = 0 (at f0) |
| When using gradient to calculate h | Make sure axis in J not eV |
| Explaining how to calc percentage uncertainty from graph | If doing worst fit, make an equation to show what to do once gradient of lowf calculated - make sure you use the gradient of the lobf, not the true gradient value (e.g. h) i.e. % uncertainty = (h from biii – h from worst line) x 100 / h from biii |
| Slit separation for 10 fringes | Make sure to make it of a single fringe |
| Better (but not more marks) explanation of why train stops faster up slope | Component of train’s weight acts against the motion/down the incline/same direction as braking force |
| Graph drawing | Label axis |
| Things to add for the terminal velocity in viscous liquid experiment | safety precaution (tray to avoid spills/ gloves/clamp tube) method to remove sphere |
| Okay important one here need to remember this for every exam | USE THE SIG FIG RULES FOR YOUR ANSWERS Unless weirdly high, 2s.f. generally best because it also accounts for sneaky 1s.f. data points in Q. DO 2 SF FROM NOW ON BUT STILL CHECK EVERY Q |
| phase difference definition | difference in degrees/radians/angle between points on the same wave or (similar) points on two waves |
| Explain in terms of path difference why point P is a bright line and point Q is a dark line. | PATH difference, not phase. whole/integer number of wavelengths - have to mention WAVELENGTHS |
| How to describe youngs double slit with white light | Lambda = ax/D So as lambda decreases, x decreases, so state rainbow colour direction. i.e. the colour closest to the centre point of each fringe is violet, going to red |
Created by:
Pyrogearos2