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Transcript
June 2009 1. Resistance [16 marks] Define resistance V splitting between components V = IR calc VI plot experiment (circuit diagram) Temp variation of lamp Temp dependence of resistance Qualitative description of resistance in parallel V=IR for total in circuit 2. EMF & internal resistance [12 marks] State: E=I(r+R) Internal resistance calc State Kirchoff’s 2nd Law Application of Kirchoff’s 2nd law Q=It calc E=QV calc % calc 3. DC Circuits [15 marks] V=IR calc Potential divider calc P=IV calc Explanation of Potential Divider circuit Potential Divider calc VI characteristic for resistor & thermistor 4. Waves [15 marks] State 2 wave phenomena Why can EM waves be polarised and sound not? Describe experiment to show polarisation of microwaves [4] Read amplitude and frequency from graph Plot new amplitude based on an increase in intensity Describe how to detect a sound wave 5. Standing Waves [13 marks] Define node Define antinode Explain formation of a stationary wave Label Node and Antinode v=fλ calc for standing wave Use a formula, state whether new conditions produce a standing wave. 6. Quantum & Diffraction Gratings [19 marks] Slit separation calc dsinθ=nλ calc max number of fringes explanation E=hf calc no. Of photons per second Explain Electron Diffraction de Broglie calc PD required to accelerate electrons to a speed calc 7. Photoelectric Effect [10 marks] Describe experiment gold leaf electroscope [5] Describe how photoelectric effect can be described in terms of quantum behaviour [5] January 2010 1. Power [12 marks] E=Pt calc P=IV then Q=IT calc number of electrons in a current calc Define drift velocity Drift velocity calc 2. Resistance [14 marks] Define resistivity resistivity calc rearranged resistivity calc P=IV calc number of _____ calc P=I2R calc percentage calc 3. DC Circuits [6 marks] Potential divider calc Read a circuit diagram to see what happens to I and V when changes are made. 4. DC Circuits [16 marks] Explanation of VI plot for an LED [5] Reading a VI plot calc Purpose of a resistor in a circuit containing an LED Advantage of potential divider circuit over variable resistor. 5. Waves [14 marks] Define wavelength Define frequency Define wave speed Derive v=fλ Define infra red radiation v=fλ calc P=1/T calc draw a d-t plot for a wave 6. Waves [14 marks] Explain interference Explain coherence Explain interference from path/phase difference λ=ax/D calc state the effect of changing bits of the above equation 7. Quantum [14 marks] E=hf calc number of photons per power calc explain energy levels and emission of photons [4] link no of photons per second to energy of a photon Analysing a photodiode (application of physics skills) 8. Wave Particle Duality [10 marks] Explain Diffraction state conditions necessary for electron diffraction de Broglie wavelength calc E=1/2mv2 then conversion from J to eV calc recognising that electrons have negative charge June 2010 1. Resistance [10 marks] conventional current vs electron flow Unit of current (recognise I=V/R) Current is the same at all points in series resistivity calc total resistance in series calc Drift velocity calc 2. Power [15 marks] Describe power ratings of light bulbs P=V2/R calc comparison of 2 lamps to figure out which has more current total resistance in parallel calc P=I2R calc temp dependence of resistance of a lamp define kilowatt-hour cost of electric calc 3. DC circuits [16 marks] draw circuit diagram of circuit to take a VI plot explanation of internal resistance (must recognise this first) application of physic skills EMF calc Internal resistance calc define intensity (of a wave) efficiency calc 4. DC Circuits [14 marks] state light dependence of resistance of LDR (using graph) PD from potential divider calc V=IR calc graph skills Explain why V changes more at low light intensity than high for LDR effect of rising resistance of one component on a circuit advantages of a data logger 5. Waves [16 marks] state a property of EM waves that other’s can’t do Name parts of the EM spectrum v=fλ calc Describe what happens to a polarised signal when bits are rotated [3] Describe UV-A, UV-B and UV-C [3] Explain how sunscreen works [1] Explain quantum nature of the photoelectric effect 6. Standing Waves [14 marks] Describe transverse vs longitudinal in terms of vibrations [4] Explain formation of a standing wave [3] Spot nodes and antinodes in pipes Sketch standing wave in pipes frequency of waves in pipes calc 7. Quantum [15 marks] explain line spectrum describe the difference between absorption and emission spectra E=hc/λ calc x 2 Spot energy level transitions nλ=dsinθ calc January 2011 1. Resistance [13 marks] resistivity calc P=IV calc resistors in series & parallel calc P=I2R calc proportionality of resistivity eqn which of 2 resistors dissipates more power explanation. 2. Current [15 marks] state charge carriers in an electrolyte and in a wire explain internal resistance internal resistance calc Q=It calc temperature dependence of resistance of a lamp suggest a fuse value (P=IV calc) Why are different fuses necessary 3. DC Circuits [14 marks] match units to quantities potential divider calc V=IR calc Temperature dependence of thermistor state the effect on a circuit of a changing resistance graph skills 4. Waves [18 marks] Compare and contrast 2 wave graphs determine whether waves are coherent v=fλ calc determine resultant displacement of interfering waves Intensity calc Path difference analysis constructive/destructive interference description. 5. Kirkchoff’s Laws [4] / Photoelectric Effect [6] State Kirkchoff’s first law Sate Kirkchoff’s second law Explain photoelectric effect 6. Quantum [10 marks] Define the electronvolt KE of electron calc explain De Broglie Wavelength de Broglie calc 7. Spectra (+ diffraction grating) [12 marks] define a photon define continuous spectrum Read a graph no of photons per power calc diffraction grating calc 8. Energy levels [8 marks] Interpret energy level diagram E=hf calc spot and explain an absorption spectrum June 2011 1. Power [16 marks] VI plots for lamp state why things do /do not obey Ohm’s law Q=It calc (using power) P=IV calc x 2 Define potential difference read a graph P=IV calc Draw a circuit diagram for series advantage of LED over filament lamp 2. Resistance [17 marks] V=IR calc (multiple resistors) total resistance in parallel calc P=I2R calc Resistivity calc total resistance in series calc EMF from VI plot for internal resistance internal resistance from VI plot 3. DC Circuits [12 marks] define intensity intensity calc potential divider calc V=IR calc V=IR calc another potential divider calc noticing that an LDR is a light sensor 4. Photoelectric Effect [16 marks] name the photoelectric effect define work function threshold frequency calc E=hc/λ calc KE max from photoelectric equation calc energy of accelerated electron in eV calc eV J calc speed from KE calc Quite complicated synoptic question 5. Standing Waves [15 marks] Determine wavelength from displacement time plot Determine time period from same plot v=f λ calc read amplitude from s-t plot define displacement define amplitude describe differences between a stationary and a progressive wave Explain the formation of a stationary wave [3] difference in amplitude between 2 points on a standing wave mark a node note the movement of a standing wave 6. Waves (interference) [14 marks] state conditions necessary for Young’s double slits to work Explain the interference pattern in Young’s Double Slits [4] Fringe separation calc (from diagram) λ=ax/D calc Know what a single slit diffraction pattern looks like 7. Polarisation [10 marks] describe a plane polarised wave Describe an experiment to check for polarisation [4] State Malus’ Law and use it to explain observations [4] January 2012 1. Resistance [12 marks] define resistivity (word equation) resistivity calc P=I2R calc kWh calc drift velocity calc 2. DC Circuits [15 marks] resistance in series & parallel calc V and I in series and parallel (statements only) State Ohm’s Law & show something obeys it from a graph link current splitting in parallel (not series) to reading a graph Explain the shape of a graph (resistance dependence on temperature) 3. Internal Resistance [17 marks] define EMF explain why terminal pd is less than emf internal resistance calc Q=It calc E=Pt calc (P=I2R first) describe a graph of a battery running out 4. Waves & interference [18 marks] Define progressive wave difference between a transverse and longitudinal wave explain diffraction describe an experiment to show diffraction of sound [4] v=f λ calc explain an interference pattern as caused by sound λ=ax/D calc for sound 5. Standing waves [10 marks] state 2 features of a stationary wave explain the formation of a standing wave use knowledge of the motion of standing waves [6] 6. EM spectrum [17 marks] name 2 EM waves similarity and difference between parts of EM spectrum explain conditions for diffraction Advantage and disadvantage of UV-B radiation know the wavelength of X-Rays number of photons per power circuit diagram in series explain polarisation (applied) 7. Photoelectric Effect [11 marks] State experiment for particle nature of light state experiment for wave nature of light define work function write down and use photoelectric equation read graph & do some quite involved analysis
