• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Lab- Response Time

Extracts from this document...


Response Time Aim: To investigate whether the age of a human affects the reaction time. Introduction: Reaction time refers to the response of an organism to a stimulus, i.e. a factor leading to an organism reacting in some way. The average reaction time for a human is 0.200 to 0.250 seconds. This difference in reaction time varies from person to person due to various factors such as Age, Gender, Time, Environmental conditions, etc. Age being the most suitable factor, was chosen for the experiment. A stimulus is detected by the eye and is transmitted to the brain in the form of a nerve impulse. This impulse is interpreted by the brain which sends another impulse to the muscles in order to respond appropriately. This process is slow for aging people as well as humans below the age of 10 while are comparatively faster for people in the age group of 10-25. ...read more.


Instruct the person to hold his fingers apart in a U shape, i.e. the thumb and index while folding the other fingers 6. Hold the ruler loosely with the 0cm marking just at the same level of the thumb. 7. Leave the ruler and instruct the person to grasp it as soo as he sees it drop. 8. Observe the distance between the beginning of the ruler and the place the ruler is held and record the result in the results table. 9. Redo steps 5-8 10 times for the same person and record results. 10. Find the average of the 10 results and use the obtained value to find the "reaction time" using the conversion graph. 11. Redo steps 5-10 for all the people chosen. Results Results table 1 Reading Distance Caught(cm) 8 years 16 years 32 years 1 18 cm 18 cm 27 cm 2 20 cm 18 cm 24 cm 3 29 cm 20 cm 26 cm 4 27 cm 22 cm 25 cm 5 ...read more.


fastest reflexes. Evaluation: The results obtained were reliable and helped me prove my hypothesis correct. However, there were no major anomalies observed but a few minor inaccuracy errors. * The experiment conducted was manual and therefore conducted various manual errors such as inaccurate distance measured. * Another manual error could be that of not holding the ruler's 0cm mark accurately at the edge of the thumb. * The time of the day gradually increased as the experiment was conducted and therefore could not be kept as controlled variable. * The person conducting the experiment gradually got used to the act and therefore would respond better. * The ruler being a length of 30 cm, often was to small a reaction distance and therefore slipped out of the hand thereby giving no result. Improvements - If I was to conduct the experiment again, I would:- * Use a digital method to investigate the reaction time, eg- Car Brake simulation. * Use a larger number of results resulting in an increase in the accuracy of my results. ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Living Things in their Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

4 star(s)

Response to the question

A very well done experiment which shows thought behind how the experiment is going to be conducted accounting for any errors that may occur and therefore affect the validity of the experiment

Read full review

Response to the question

A very well done experiment which shows thought behind how the experiment is going to be conducted accounting for any errors that may occur and therefore affect the validity of the experiment

Level of analysis

The candidate starts with an aim for the experiment and some good background information. The candidate shows how the stimulus is processed, which would have been better aided by a diagram to show the simple neuronal pathway. The candidate also shows consideration of the different factors which could affect the experiment and attempt to account for them during the experiment. I would not use the words lesser reaction time I would use smaller reaction time. The experiment is researched well with the aid of diagrams to plot the reaction time against the drop distance and to show how the experiment is set up. The method is easy to read, but I'm not sure the experiment would be reliable as the drop distance start points would surely differ although this is accounted for to some degree. The errors and possible improvements are done well, although the candidate does not suggest many improvements to improve that particular method of experiment.

Quality of writing

Punctuation, grammar and spelling all done to a high level of accuracy. Layout is done well with clear subheadings.

Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by skatealexia 06/08/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Living Things in their Environment essays

  1. Marked by a teacher

    Research question - Is using dogs for work ethical?

    5 star(s)

    Cosmetics have no benefit to our health, and if anything can damage our skin in the long run. Although testing cosmetics on animals had been banned in the UK since 1998, other countries continue this approach to making humans 'more safer'.

  2. Marked by a teacher

    An experiment to investigate the species diversity in non-trampled and trampled areas.

    4 star(s)

    I also found out the depth of the soil in each quadrat by pushing the needle into the soil and measuring how deep it travels. A soil sample was taken to measure the pH. There was a bit of percipitation when the investigation was carried out.

  1. Marked by a teacher

    In this experiment, mung bean seedlings and Brine shrimp eggs were used to study ...

    4 star(s)

    Once they are placed in water, the cyst-like eggs hatch within hours. They have a biological life cycle of one year which they grow and mature to around one cm long (http://en.wikipedia.org). Though it is just over a centimetre in size, it is a well-known species due to its importance as a food source for fish and crustaceans.

  2. Marked by a teacher

    An Investigation into a Woodlice's Preferred Choice of Environment.

    3 star(s)

    They are inserted directly in the middle of the four conditions. Once they are in I will commence timing. At every 30 seconds I will count the wood lice to see how many are in each condition, until ten minutes of timing has passed.

  1. explain why Antarctica is so special and therefore why we need to protect it, ...

    going to either mine for gold, oil or plutonium, or fish for Blue Whales. So I think that not one, but two questions stand to answer. One being - What is going to happen to Antarctica in the future? And the second one being - How do we prevent people from exploiting Antarctica?

  2. Testing the effectiveness of various anti microbial agents.

    *The agar plates now need to be sealed; to do this use cellotape and stick it on to the lid and over the side in a crossed position (look at diagram 'B'), and left in a controlled environment. This should be stored for 48 hours at just over room temperature.

  1. How Do Fishing Methods Harm The Environment?

    bottom and leave it for a few days and then go and pick it up and see what you've caught. -Dynamite Fishing Dynamite fishing is where you chuck a stick of dynamite into the ocean and explode it, then you pick up the remains.

  2. Branded Bleach is more effective at killing E. coli than Non branded bleach - ...

    area called the zone of inhibition where it appears clear on the Petri dish. This area can be measured using mm�graph paper, the larger the area of the zone of inhibition - the more effective the bleach. Both bleaches contain ingredients which cause a chemical reaction which causes the bacteria's death, these are the active ingredients.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work