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# Physics sensor coursework watch

1. hey guys
doing some as-level physics coursework now (OCR). chosen a sensor and taken readings in order to calculate its sensitivity, systematic error, resolution, response time, etc.

bit iam having trouble with is the analysis. how do i derive sensitivity and systematic error from my readings? iam confused as their definitions seem to be rather ambigious and cross over.

so far i have calcualted the ratio of change in output compared to change in input, which is what i believe sensitivity to be. but my teacher said something about standard deviation (which i have never coverd in maths) and error bars?

any help much apprieciated.
2. sensitivity is how much the output changes with a change in imput, eg if you are doing a temperature sensor, the sensitivity is the voltage difference when the temperature increases by a kelvin.

the standard deviationand error bars are for the second part, for the systematic error
3. hey this might sound stupid, but which is the best tense to write a report like this in. i know there are probably no marks associated with it, but i tend to absent mindedly switch tenses all the time. which one should i use and stick with?

and also can anybody outline an appropiete strucuture?

thanks
4. Use the past tense should be OK.

Plan
Strategy/Pratical skills & techniques
Record of observations/presentation of report
Fitness of system for purpose
5. anyone know how a signal generator works?
6. dudes iam quite stuck. iam still confused about how to work out sensitivity and systematic error for my results. I measured the amplitude (in volts) a sound wave direct from a signal generator, and the amplitude of the same sound wave (in volts) after it had been sent through a loudspeaker and picked up by a condenser microphone.
I repeated the measurements of the sound wave after it has been sent through the mircophone 3 times.
A V1 V2 V3
0.425 0.240 0.240 0.240
0.400 0.230 0.235 0.230
0.360 0.220 0.220 0.220
0.325 0.200 0.200 0.200
0.300 0.170 0.170 0.170
0.275 0.155 0.155 0.155
0.250 0.140 0.140 0.140
0.225 0.125 0.125 0.125
0.200 0.110 0.110 0.105
0.175 0.100 0.095 0.100
0.150 0.080 0.075 0.080
0.125 0.060 0.065 0.065
0.100 0.050 0.055 0.005
0.075 0.040 0.040 0.040
0.050 0.023 0.023 0.020

how do i work out the sensitivity and systematic error?

thanks

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