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AQA A LEVEL PHYSICS PAPER 1 EXAM QUESTIONS AND DETAILED ANSWERS| ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS WITH STUDY GUIDE|ALREADY GRADED A|GUARANTEED PASS|LATEST UPDATE 2024.R387,81
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AQA A LEVEL PHYSICS PAPER 1 EXAM QUESTIONS AND DETAILED ANSWERS| ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS WITH STUDY GUIDE|ALREADY GRADED A|GUARANTEED PASS|LATEST UPDATE 2024.
AQA A LEVEL PHYSICS PAPER 1 EXAM QUESTIONS AND DETAILED ANSWERS| ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS WITH STUDY GUIDE|ALREADY GRADED A|GUARANTEED PASS|LATEST UPDATE 2024.
AQA A LEVEL PHYSICS PAPER 1 EXAM QUESTIONS AND DETAILED ANSWERS| ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS WITH STUDY GUIDE|ALREADY GRADED A|GUARANTEED PASS|LATEST UPDATE 2024 . What is meant by monochromatic light - CORRECT ANSWER light of a single frequency What is meant by coherent - CORRECT ANSWER constant phase difference Effect on diffraction pattern when wavelength decreases (3) - CORRECT ANSW ER Maxima closer together (1) angle decreases (1) smaller path difference (1) What happens when white light is used in slits instead of monochromatic light? (4) - CORRECT ANSWER Central bright fringe (maximum) is white (1) Fringes on either side are cont inuous spectra (1) Dark fringes would be closer together due to λred being larger than the average λwhite (1) Bright fringes (maxima) are wider How do diffraction patterns (fringes on the screen) form? - CORRECT ANSWER Interference (1) from light from t wo slits overlapping (superposition) (1) maxima where crests meet (constructive interference) (1) dark fringes/minima form where crest and trough meet (destructive interference) (1) Formation of a stationary wave - CORRECT ANSWER Two waves superpose (1) same wavelength and/or frequency (1) Travelling with equal and opposite velocity (direction of movement) (1) stationary vs progressive waves (3 for each) - CORRECT ANSWER stationary: have nodes/antinodes (1) points between nodes all in phase (1) cannot t ransfer energy progressive: no nodes/antinodes (1) within one wavelength all points are out of phase (1) can transfer energy How does TIR transmit information in an optical fibre? (2+ diagram) - CORRECT ANSWER Core has higher refractive index than cladd ing (1) when incident light at a greater angle than critical angle of cladding TIR occurs (2) Observations of a polarisation filter rotation? ("What observations could be made when the filter in rotated through 360˚?") - CORRECT ANSWER Variation in intensity between maxima and minima (light and dark) (1) Two maxima and Two minima within 360 (1) define moment of a force (2) - CORRECT ANSWER force x perpendicular distance around a pivot (1) between force and pivot (2) define center of gravity - CORRECT ANSWER the point in a body (1) where the weight of an object appears to act (1) state principle of moments - CORRECT ANSWER for a body in equilibrium (1) the sum of clockwise moments about a point (1) is equal to the sum of anticlockwise moments state the principle of conservation of momentum - CORRECT ANSWER total momentum before = total momentum after (1) in an isolated system (no external force) state the relationship between the force acting on a body and the momentum of the body - CORRECT ANSWER force proportional to rate of change of momentum define center of mass - CORRECT ANSWER the point in the bod y through which the mass appears to act conditions for equilibrium - CORRECT ANSWER resultant force is 0 (1) resultant torque is 0 (1) difference between scalar and vector - CORRECT ANSWER vector has magnitude and direction scalar only has magnitude definition of elastic limit - CORRECT ANSWER maximum force/load which can be applied to the object without it being permanently deformed define hookes law - CORRECT ANSWER Extension is proportional to the applied force up to limit of proportionality (1) as long as extension is small (1) newton's first law - CORRECT ANSWER object in motion remains in motion and object stationary remains stationary till external force acts on it newton's second law - CORRECT ANSWER f=ma newton's third law - CORRECT AN SWER every action has an equal and oppisite reaction define yield stress of a material - CORRECT ANSWER force per unit area (1) at which material permanently deformed (1) for no/small increase in force define density of a material - CORRECT ANSWER mass per unit volume explain what is meant by spring constant (k) - CORRECT ANSWER force divided by extention state what is meant by a superconductor (2) - CORRECT ANSWER conductor which has 0 resistance (1) at critical temperature (1) state what is meant by the emf of a battery (1) - CORRECT ANSWER energy changed to electrical energy per unit charge What is meant by work function (2) - CORRECT ANSWER Minimum energy required by an electron to escape from (1) a metal surface (1) What is meant by ionisation energy? (2) - CORRECT ANSWER Minimum energy required to remove an electron from an atom (1) fro m the ground state (1) Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) - CORRECT ANSWER Energy of a photon is fixed/constant (1) Energy is required for electrons to overcome work function ø (1) Electrons deeper into/ below the surface of the metal require more energy to overcome work function and therefore have less KE(1) Maximum KE = Energy of photon - work function ø (1) Explain how (bright ring) diagram is evidence of the wave -particle duality of electrons? - CORR ECT ANSWER Diffraction pattern maxima/minima (bright and dark areas) (1) Diffraction is a property of waves - proves wave -behaviour of electrons (1) What is meant by the ground state? - CORRECT ANSWER The lowest energy state of an atom Explain the differ ence between excitation and ionisation (2) - CORRECT ANSWER An electron receives a discrete amount of energy for BOTH (1) Excitation promotes an electron to a higher energy level Ionisation is when an electron receives enough energy to leave the atom Explain why only photons of certain frequencies cause excitation (4) - CORRECT ANSWER discrete energy levels (1) Electrons need to absorb a DISCRETE amount of energy to move to a higher energy level (1) Photons need to have a certain frequency to provide thi s energy, because E=hf (1) interaction is a 1:1 reaction all of the photon's energy is absorbed (1) Explain how excitation takes place in a fluorescent tube - CORRECT ANSWER Electrons flow through the tube to the applied PD causing a current to flow (1) Electrons collide with mercury atoms in the tube (1) This raises electrons in the mercury atom to a higher energy level (1) What is the purpose of coating in a fluorescent tube? - CORRECT ANSWER UV/ High energy photons emitted from mercury atoms when the electrons in the atom de -excite (1) High energy photons absorbed by the coating (1) Coating emits photons in the visible spectrum (1) What happens when annihilation occurs? (2) - CORRECT ANSWER particle and an anti -
particle collide and cease to exist (1 ) Their mass is released as energy in the form of a pair of gamma photons (1) How does the strong nuclear force between two nucleons vary with the separation of the nucleons? (3) - CORRECT ANSWER repulsive at < 0.5 fm (1) attractive from 0.5 to 3 fm (1) above 3 fm, force 0 (1) define potential difference - CORRECT ANSWER work done per unit charge explain why the use of superconductors would improve the efficiency of power statio ns and hence reduce carbon dioxide emissions - CORRECT ANSWER less energy lost (In conducting wires) (1) less fuel needed (1) explain what is meant by a potential divider - CORRECT ANSWER a combination of resistors across a voltage source to produce a r equired pd state what is meant by 'non -ohmic' - CORRECT ANSWER resistance not constant (V not directly proportional to I) example of non -ohmic conductor - CORRECT ANSWER filament lamp/LDR/thermistor Advantage of using a stranded cable rather than a so lid cable of the same cross -sectional area - CORRECT ANSWER larger surface area so better heat dissipation Explain what is meant by resonance (4) - CORRECT ANSWER driving frequency = natural frequency (1) vibrations of large amplitude produced (1) max e nergy transferred at resonance (1) phase difference between driver and oscillator is 90 degrees (pi/2 rads) Explain what is meant by forced vibrations (5) - CORRECT ANSWER forced vibrations = periodic force applied (1) frequency determined by as frequenc y of oscillator (1) phase difference is 180 degrees (pi rads) (1) frequency of driver > frequency of oscillator (1) amplitude small at high frequency and vice versa explain what is meant by damping - CORRECT ANSWER removes energy from oscillating system (OR when force opposes motion of oscillator) how does damping affect resonance - CORRECT ANSWER reduces amplitude at resonant frequency name two types of potential energy involved when a mass -spring system performs vertical SHM - CORRECT ANSWER elastic potential and gravitational potential
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