4.1 Analysis of result
This is the equation to calculate Planck’s Constant, where c=the speed of light, e=the charge on an electron and m=gradient of linear regression.
Our result was:
4.2 Key findings
We found out that our value of Planck’s constant had a percentage error of 59.8% when compared with the actual value of Planck’s constant.
4.3 Explanation of key findings
We could not find an accurate result for Planck’s constant. One of these factors could have affected our results:
- Different brand of LEDs used in the experiment
- We used different voltage batteries for different LEDs as different LEDs have different activation voltage
- We used a 10kΩ resistor instead of a 1kΩ resistor suggested by another experiment done by other people.
- We might have set up the circuit wrongly, causing the electricity to flow more in some places and less in others, causing the results to be inaccurate
4.4 Evaluation of hypothesis
We failed to prove our hypothesis that the value of Planck’s constant is 6.6704 × 10-34 m2 kg / s and has a percentage error of less than 10%.
4.5 Areas for improvement
Do our experiments faster so that we do not have to rush when we need to plot our graphs and tables. As we spent most of our first few lessons trying to figure out the best way to set up the circuit, we wasted a lot of time, causing us to rush in the later parts.
Have a bit more background knowledge on electronics so that we don’t struggle to assemble the circuit and make sure that it is correct. As we did not know much about electronics, we struggled to figure out how to set up the circuit
Plan ahead to get equipment and resources. We took a very long time to get all our equipment and resources and because of that, we started our experiment late.