Aqa A Level Physics Paper 1 Study Guide Graded A+

What happens when white light is used in slits instead of monochromatic light? (4) {Ans: Central bright fringe (maximum) is white (1) Fringes on either side are continuous spectra (1) Dark fringes would be closer together due to λred being larger than the average λwhite (1) Bright fringes (maxima) are wider}What is meant by ionisation energy? (2) {Ans: Minimum energy required to remove an electron from an atom (1) from the ground state (1)}Explain what is meant by forced vibrations (5) {Ans: forced vibrations = periodic force applied (1) frequency determined by as frequency 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}define center of gravity {Ans: the point in a body (1) where the weight of an object appears to act (1)}describe what is meant by the period of an oscilation {Ans: time taken for one complete oscillation}define hookes law {Ans: Extension is proportional to the applied force up to limit of proportionality (1) as long as extension is small (1)}explain what is meant by a potential divider {Ans: a combination of resistors across