An estimate of reading uncertainty for an digital scale is generally taken as:  - ± 1 in the least significant digit displayed. , Define precision - The smallest division in the scale of a measuring instrument/The smallest non-zero reading an instrument can take, What is shown by the gradient of a velocity-time graph - Acceleration, What is shown by the area under a velocity-time graph - Change in displacement, Give the equation for Work done - Force × displacement in the direction of the force, Effect of friction on a moving object - Transfers kinetic energy primarily to thermal energy, In an Inelastic collision some kinetic energy - is transferred to other forms, Why can SUVAT equations can be used for the vertical component of projectile motion - Since the motion is in a single direction with a constant acceleration, What is the effect of air resistance on the motion of an object projected above the horizontal - Reduces the maximum height reached and makes the descent of the projectile steeper than the ascent., what is the value of c - 3*10^8, Define Baryon: - 3 quarks - proton….., Define - Potential Difference - work done moving unit charge between 2 points, what does a moving charge produce? - a magnetic field, what is an application of Total Internal Reflection? - Fibreoptics, what does laser stand for - light amplification by stimulated emission of eradiation, A photon of energy less than the work function incident om a metal. What will happen? - Nothing, A photon of energy = the work function incident om a metal. What will happen? - An electron will just be emitted, What is r.m.s and why do we use it? (electricity) - root mean squared - value used as average for an ac source. Peek would be too high, and true average would be 0 - DC equivalent, What is the voltage and frequency of UK mains? - 230v (declared value- in real life it varies) 50 hz, What equation links current and e.m.f - E = IR + Ir, In an V/I graph, how do we calculate E.M.F - y intercept, State the equation for capacitance - C=Q/V, Describe an p-type semiconductor - in terms of electrons - e.g.Silcone doped with Indium - a missing electron - positively charged hole. Free charge carrier is +'ve charge, Describe an p-type semiconductor - in terms of band structure - Extra holes close to valance band - electrons can easily move to these hols. Fermi level closer to valance band,

Higher Revision Roulette 7

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