Planck’s Constant Experiment :: Papers

Planck’s Constant Experiment IMPLEMENTING Before I started the experiment, the battery was disconnected with the circuit because I needed to check that the LED is connected in the right direction in the circuit. However the apparatus I set up for the experiment was correct since I followed the diagram and method on the plan step by step. The circuit worked and there was no accident happen during the experiment. Before the experiment I prepared a result table for recording voltages for each different type of LED. Throughout the experiment I worked carefully by turning off the knob on the potentiometer every time I had to change the LED or move the apparatus. Also I left the space around the circuit clear so that I would not get confused with things that I needed to use and things that I did not want. The working area was well organised. My equipments did not get mixed up with others. Because this experiment does not take long to read out the values of voltage of each LED, I decided to do 5 repeats for each LED instead of 3 repeats, as I planned. After I had done all 5 repeats for each LED, I used values of voltage and current to calculate the resistance. Then I plotted the graph of E against ƒ to see if there is any anomalous. However I did not have any anomalous result so I did not need to do any more repeat. I did not modify my plan procedure since it worked smoothly. OBSERVING AND RECORDING Results: Voltage (V) Type of LED 1st Repeat 2nd Repeat 3rd Repeat 4th Repeat 5th Repeat WL27 1.63 1.63 1.62 1.60 1.60 WL28 1.65 1.65 1.63 1.64 1.65 WL29 1.49 1.48 1.48 1.47 1.49 WL30 1.