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From the graph it is seen that as we take tuning forks of higher frequency the length of the top of the tube from the top layer of the water decreases. It can be clearly stated that the length of the tube is inversely proportional to the frequency of the tuning fork. The data related to the question agrees as the speed of the sound in the resonance can be found with the formula . L + e = v/4f Where L= length of tube from the top layer of water E= end of correction V= speed of sound in resonance tube F= frequency of tuning fork End correction is the anomal difference between the frequency of a tuning fork and the corresponding sound waves inside of a tube. It is caused because generally there is space between the fork and the pipe end, causing the air column to vibrate a short distance beyond the edge of the tube.

The formula for end correction is = 0.6 x radius Where radius = 1.77cm when measured with the use of a vernier caliper. Evaluation 1. There is a �0.1 error in the graph. After drawing the slope it can be seen that most points pass through or are pretty close to it. 2. The data given is very much sufficient to address the practical question. 3. Possible errors that may occur would be human errors because the sound heard may not be the loudest but still recorded or maybe writing down the incorrect frequency or length. There might be a systematic error such as a defected tuning fork or resonance tube.

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Improving the Investigation 1. Trying the experiment more than one time to reduce error. 2. Work in a group to make sure everyone can hear the sound.To observe the energy produced per second depending on the rate of cooling from the objects depending upon the relative ability of its surface to emit energy by radiation of heat. Hypothesis The black body has an emissivity of 1 whereas the silver body has an emissivity of 0.1. Emissivity is referred as the ability to emit energy by radiation. Hence the black body will produce more energy. The experiment has to perform with great caution so as the heat radiated by our body does not interfere with the calculated readings.

Method

1. Acquire a clamp stand and fix the thermometer to on it 2. Boil water greater , then 85 degrees Celsius and pour the water into a graduating cylinder of volume 250 ml 3. After measuring the volume pour the water into anyone of the cylinders depending on which the experiment is performed i.e. If one is performing experiment on black cylinder pour the water into black cylinder. 4. After pouring the water in to the cylinder, adjust the cylinder on the clamp stand such that the thermometer is in the boiling water in the center of the container and touches no surface inside the container. 5. At 85 degrees Celsius start the stopwatch and take the temperature readings at equal intervals of time of 20 seconds until 180 seconds 6. Perform the experiment 5 times for each of the cylinders

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