H556 Exploring Physics OCR A-Level Physics (Paper 2)

H556 Exploring Physics OCR A -Level Physics (Paper 2) What is the value of the prefix T (tera) - 10¹² What is the value of the prefix G (giga) - 10⁹ What is the value of the prefix M (mega) - 10⁶ What is the value of the prefix k (kilo) - 10³ What is the value of the prefix d (deci) - 10⁻¹ What is the value of the prefix c (centi) - 10⁻² What is the value of the prefix m (milli) - 10⁻³ What is the value of the prefix μ (micro) - 10⁻⁶ What is t he value of the prefix n (nano) - 10⁻⁹ What is the value of the prefix p (pico) - 10⁻¹² What six base units of the SI system are used in A Level Physics? - metre, kilogram, second, Ampere, Kelvin, Mole What six base quantities of the SI system are used in A Level Physics? - length, mass, time, electric current, absolute temperature, amount of substance. What is the base unit of mass? - kg What is the base unit of length? - m What is the base unit of time? - s What is the base unit of current? - A What is the base unit of absolute temperature? - K What is the Unit of potential difference? - V What are the Units of density? - kgm⁻³ What is the SI unit of energy? - J What is the SI unit of power? - W What is the SI unit of charge? - C What units are equivalent to the volt? - JC⁻¹ What base units are equivalent to the Newton? - kgms⁻² What base units are equivalent to the Joule? - kgm²s⁻² What units are equivalent to the Pascal? - Nm⁻² What are the units of momentum? - kgms⁻¹ What are the uni ts of resistivity? - Ωm What units are equivalent to a Watt? - Js⁻¹ What are the units of angular velocity (ω)? - rad. s⁻¹ What is 1m² in mm²? - 10⁶mm² What is 1m³ in cm³? - 10⁶cm³ What is 1km² in m²? - 1x10⁶m² What is 1cm³ in mm³? - 10³mm³ There are 10²⁴ free charge carriers per m³ of a material. How many are there per mm³? - 10¹⁵ 10⁶ particles strike each mm ² of a surface per second. How many strike 1m ² of the surface per second? - 10¹² If there is 1 particle per mm³, how many are there p er m³? - 10⁹ Water has a density of 1000kgm ⁻³. What is this in kgcm ⁻³? - 10⁻³ Water has a density of 1000kgm ⁻³. What is this in gcm ⁻³? - 1 What is a control variable? - Something that must be kept constant to prevent it affecting the dependent variable What is meant by the repeatability of results? - Similar results would be obtained from repeats of the same measurement from the same experimental set up. What is meant by the reproducibility of results - Similar results would be obtained from repeats by different people with different equipment. How can you ensure a metre rule is held vertically? - Use a plumb line, set square or spirit level How do you avoid parallax error? - Ensure eye, object and scale are all in line with each other OR ensure object and scale are directly adjacent to each other What is meant by the term random error? - Errors that cause the measurement to vary in unpredict able ways. What is a systematic error? - An error that causes the measurements to differ from the true value by a consistent amount. What is a zero error? - An error that occurs due to the measuring instrument reading a non -zero reading when the measured quantity is zero. What is meant by the accuracy of a result? - How close a measurement is to the 'true' or accepted value What is meant by the precision of results? - How close repeated measurements are to each other. What is meant by the resolution of a measuring instrument? - The smallest change in quantity that can be measured. What determines the resolution when using a multimeter? - The scale selected. What is the resolution of a metre rule? - 1mm What is the resolution of vernier calipers? - 0.1mm What is the resolution of a micrometer - 0.01mm How do you find the absolute uncertainty from repeated readings? - ± ½ the range of the repeats How do you estimate uncertainty when repeated results are identical? - ± ½ the resolution of the instrume nt How do you calculate percentage uncertainty? - (Absolute uncertainty ÷ 'calculated OR measured' value) × 100 What do you do to the uncertainties when quantities are added or subtracted? - The absolute uncertainties are added together What do you do to the uncertainties when quantities are multiplied or divided? - The percentage uncertainties are added together