Abstract:
To investigate whether the relationship between light intensity varies inversely with the square of the distance holds truth in real-life situations and or under laboratory conditions. Furthermore, techniques utilised in the experiment included measuring the distance from the light source to the light sensor, recording the light intensity of a light source and recording observations with accuracy. The light from the light source that passes through the cardboard cylinder tube changes as the distance from the light sensor increases. The result shows that the relationship between light intensity varies inversely with the square of the distance holds truth in real-life situations and or under laboratory conditions.
Introduction:
The purpose of this experiment was to investigate whether the relationship between light intensity varies inversely with the square of the distance holds truth in real-life situations and or under laboratory conditions. Since, the light of a non-coherent light source will spread out uniformly in all directions. In other words, any point source which spreads its influence equally in all direction without limit to its range will obey the inverse square law. Luminous intensity is proportional to the inverse square of distance, I ∝1/r2. The light intensity is equal to the light reflux over watts. The light intensity is the power of the lighting energy and its unit is candle (cd). The unit for lighting reflux is lumen (lm).
It is hypothesised that if the distance increases the light intensity will decrease and therefore it will obey the inverse square law.
The graph above demonstrates that as the light sensor is further away from a light source, the less bright the source is. This mea...
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... tube.
5. The microscopic light was placed in the mouth of the cardboard cylinder tube, facing the light sensor.
6. The light sensor was connected to the lab quest.
7. The distance from the light sensor to the microscopic light was measured using the ruler. The distance was recorded into a data table.
8. The microscopic light was turned on by plugging into the wall socket.
9. The light sensor was turned on in order to measure the light intensity of the microscopic light. The data for the light intensity of the microscopic light was saved with an appropriate name into a USB flash drive. The data was recorded into a table at home.
10. Step 4, 5 and 6 was repeated three times but with different distances, different light sources such as LED light, and fluorescent light.
Under laboratory:
Repeat the procedure for the real-life situation but in a dark room.
Absorbance was defined as: log I_o/I where I_o is incident light and I is the transmitted light. Fluorescence emission spectrum is different from fluorescence excitation spectrum because it records different wavelengths of chemical s...
The results of this experiment are shown in the compiled student data in Table 1 below.
Investigating the Effect of Light Intensity on the Size of a Plantain Leaf Title: To investigate the effect of light intensity on the size of a plantain leaf. Hypothesis: I predict that the size of the plantain leaves would increase as the light intensity decreases. Therefore, plantain leaves found in the shade will have larger surface areas than leaves found in an open area. Theory: Sunlight is an essential factor need to complete the process of photosynthesis.
= I have decided to produce a step-by-step guide for each experiment. just to ensure that when we actually come to conducting the practical work, it runs flawlessly. This will also help us conduct fairer tests. as we will be following the same set of steps each time we collect a result.
To continue the experiment further I can use a different source of light to test the intensity of light. For the food coloring experiment, I could use a different food color such as yellow or orange to test.
= > [CH2O} + O2 + H2O, This shows that when the light intensity is increased the rate of reaction will be more quicker he only anomalous result there was, is the one in the 100 watt result the reading after 5 minutes is anomalous because it does not follow the predicted pattern of increasing in the production of gas because it is lower I know from my own knowledge of photosynthesise that when the light intensity is increased the rate of reaction will be more quicker because many plants and trees photosynthesise quicker in stronger light and photosynthesise slower in dimly lit places. The chlorophyll absorbs light energy and enables it to be used by the plant for building up sugar. The overall effect is that energy is transferred from sunlight to sugar molecules.
After five the test tube was removed and cooled to room temperature. Three more test tubes were obtained and labeled 1, 2, and 3. The correct reagent was added to each test tube as seen. The spectrophotometer was adjusted
Planning Firstly here is a list of equipment I used. Boiling tubes Weighing scales Knife Paper towels 100% solution 0% solution (distilled water) measuring beakers potato chips Cork borer. We planned to start our experiment by doing some preliminary work. We planned to set up our experiment in the following way.
projected its rays through the tinted glass... But in the western or black chamber the effect of the
Williams, B. 1999. A History of Light and Lighting. [online] Available at: http://www.mts.net/~william5/history/hol.htm [Accessed: 5 Jan 2014].
Limitations of Experimental Design- My experimental design helped answer the original question adequately. Since the syringes were small, wrapping them in colored film was relatively simple and took little time to do. Using colored film was also more effective than using colored bulbs, the original plan. Colored bulbs would have ...
(add the number of bubbles for each trial of a light source and divide by 5)
The reason light intensity is being used compared to whether or not a plant needs light. It is because The experiment wants to show that the rates of photosynthesis will vary according to how much light from a light bulb will be trapped in. the chloroplasts, in the leaf. The more energy trapped the more efficient a chemical reaction can take place and the speed of photosynthesis will increase. There are many things which can affect the photosynthesis of a plant such as light intensity, temperature and carbon dioxide levels.
The entire exercise was all about caring for and using the microscope. We performed various activities that enabled us to familiarize ourselves with the parts and uses of the microscope. Using the microscope, we observed different objects such as cotton, silk, hair, and even a letter "e." We viewed it using both the low power objective and the high power objective. We did these activities in order to better understand how the compound light microscope works and also to learn about the different procedures in setting up a slide. The results of the activity made us learn how to operate the microscope efficiently. I found out that the iris diaphragm controls the light and the uses of the LPO and HPO. I also noticed that the view of the object being illuminated is inverted.