You can carry out a number of investigations to determine the effect of a specific factor on human reaction times.
A suitable investigation could be the effect of caffeine or the amount of background noise in the room. A simple method to measure the effect is to use the ruler drop test.
|Catch distance (cm)||Reaction time (ms)|
Important: 1 millisecond (ms) is one thousandth of a second. (1/1000 s)
|Attempt||Distance on ruler (cm)|
|With noise||Without noise|
What affect does noise have on the speed of reaction, measured in centimetres? Use data to support your answer. [3 marks]
When the person tried to catch the ruler without noise, they could catch it sooner than if there was noise in the background. [1 mark]
For example, the first set of data, with noise the distance was 25 cm, compared to without noise where it was 18 cm. [1 mark]
This suggests that noise increases the reaction time of the person in this experiment. [1 mark]
Tip - Make sure you include data to support your answer, as you are asked to do in the question.