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A-Level Physics Paper 3A-Questions and Answers 100% Solved
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A-Level Physics Paper 3A-Questions and Answers 100% Solved
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A-Level Physics Paper 3A-Questions and Answers 100%Solved
Express 7GΩ in standard form. Correct Ans-7 x 10^9 Ω
What is 1 eV in J? Correct Ans-1eV = 1.6 x 10^-19 J
Express 6kWh in joules. Correct Ans-6 kW = 6000 J/s, 1 hour= 3600s
6kWh = 6000 x 3600
= 21.6 x 10^6 J
= 21.6 MJ
Convert 6.6pJ to eV. Correct Ans-6.6pJ = 6.6 x 10^-12 J
Divide by 1.6 x 10^-19
6.6pJ = 4.1 x 10^7 eV (2sf)
= 41MeV
, A-Level Physics Paper 3A-Questions and Answers 100%
Solved
What is a random error? Correct Ans-An error that affects precision and cannot be
completely removed, it causes differences in measurements.
What is a systematic error? Correct Ans-An error that affects accuracy and occurs due to
faults in equipment or experimental method, causing the result to be too large / small by the
same amount each time.
What are 3 ways to reduce random error? Correct Ans--Take at least 3 repeats and
calculate a mean.
-Use a computer or a data logger.
-Use higher resolution equipment.
A mass balance reads 1004g when a 1kg mass is placed on it, is this a random or systematic
error? Correct Ans-Systematic as the reading is too high by 4g each time.
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