Again we will use ρ=m/V in order to calculate the density of water. Experimental technique The first part of experiment is done in following steps: The second part of experiment is done in following steps: Results The density of water by using hydrometer: 1. 26.5 °C room temperature 2. 37.8 °C and 36.3 °C 30-40 °C 3. 41.7 °C and 40.2 ° C 40-50 °C 4.
Microwaves use radiation to cook your food, and surprisingly, this radiation “has enough energy to damage DNA and cause cancer” (Rolfo). If these radiation waves stayed inside the microwave, then there wouldn’t be a problem, but they don’t. When radiation enters your body, it does not eventually go away, but instead, it builds up over time until your body cannot cope with the amount of radiation. It is important to realize that “each exposure to radiation builds up in our body and the risk of cancer increases with each radiation exposure” (Bromberg and Covarrubias). Throughout your lifetime, as you are exposed to this radiation from your microwave, it slowly adds up and increases your risk for cancer.
These radio waves emitted are typically below a watt. The rate at which energy is absorbed by the human body is measured by the Specific Absorption Rate (SAR), and its maximum levels for modern handsets have been set by governmental regulating agencies in many countries. THERMAL EFFECTS The effects of electromagnetic radiation on biological systems depend both on the radiation 's power and frequency. For electromagnetic of visible frequencies or lower (i.e., radio, microwave, infrared), the damage done to cells and other materials is determined mainly by power and caused primarily by heating effects from the combined energy transfer of many photons. An effect of microwave radiation is dielectric heating, which is the process of heating a dielectric material such as living tissue.
Applying this statement to the experimental setup, the average kinetic energy of the molecules of warm water is therefore much higher than that of the cold water. So, the molecules of warm water are actually able to occupy more space because of their rapid velocities and high kinetic energies. Because the constituent particles of the warm water occupy more space, the substance is therefore low in density. Now, there are not many differences between the properties of warm water and cold water in the experiment — including mass. Nonetheless, it is the disparity in temperature and density of the water that accounts for the results of the experiment.
Second, was ascertained the contribution of solute concentration in osmotic flow and the last experiment evidenced that the lesser the molecular weight higher the diffusion. Thus, passive transport is influenced by the size of the molecules, solute concentration
Firstly, 39.15 g of water was used and molar mass of metal was determined to be 61.43 g/mol, then 50.88 g of water was used and molar mass of metal was determined to be 59.24 g/mol. If the amount of water in the calorimeter varies, and thus the heat capacity of the water would vary. Firstly, specific heat capacity of metal was determined, which depends on heat of the water mass of the water and mass of the solid, then molar mass using: MM= 25/(S.H. (J/(g℃)) ) In the Part B of the experiment q_(H_2 O) for the reaction was find to be 2279.5 joules, ∆H for the reaction = -2279.5 joules, ∆Hsolution = -455.9 joules/g. This solution reaction is exothermic; because temperature was increased meaning heat was released.
Radio waves—especially microwaves—are the most proficient channels of messages for the reason that radio waves are less likely to be affected by cosmic dust than visible light. They can also cross the threshold of the Earth’s atmosphere. Aside from that, there is very little circumstantial interference—either from man-made or galactic sources—for radio waves. Simply put, there is less of a radio background to take care of in the
To control this, the water being used will be placed inside a room with a room temperature of 20°C for an hour to allow the temperature of the liquids to drop and remain at that temperature. Apparatus List: A wine glass. An electric thermometer to measure the temperature of the water. (degrees celsius) ]The FFT properties application on a computer. A professional microphone to detect the frequency from the sound that is produced.
Experimental study on heat sink for thermoelectric generator 1 Introduction Thermoelectric devices are considered playing an important role in the green energy technology. In our daily life, enormous amount of waste heats is produced and they are not recycled. Thermoelectric generator can recover the waste heat to produce energy [1, 2]. In the United State, it is estimated that there are 20% to 50% of industrial energy input is lost as heat , this shows that many of the power have been wasted. Thus, recover of waste heat via different system, such as using thermoelectric generator, can bring great benefits and indirectly increase the efficiency of our system.
Electromagnetic radiation is, classically speaking, a wave of electricand magnetic fields propagating at the speed of light c through empty space. In this wave the electric and magnetic fields change their magnitude and direction each second. This rate of change is the frequency ν measured in cycles per second—namely, in hertz. The electric and magnetic fields are always perpendicular to each other and at right angles to the direction of propagation, as shown in Figure 2. There is as much energy carried by the electric component of the wave as by the magnetic component, and the energy is proportional to the square of the field