Radiation from cell phones
The materials required for the science fair project:
- An Ericsson cell phone
- A Nokia cell phone
- A Motorola cell phone
- 3 test tubes
- 30 ml of water
- A measurement cylinder
- 3 thermometers
- A stopwatch
1. For this science fair project, the independent variable is the brand and model of the cell phones used for this experiment. The dependent variable is the temperature of the water in the test tube. This is determined by using a thermometer to measure the water temperature. The constants (control variables) are the amount of water in the test tube, the length of time the cell phone rings, and the room temperature.
2. The experiment is carried out with 3 brands of cell phones manufactured by Ericsson, Nokia and Motorola. One cell phone (any model) from each manufacturer will be tested.
3. The test tube is filled with 10ml of water and a thermometer is placed inside the test tube. The initial temperature of the water is measured and recorded in the table below.
4. The cell phone to be tested is placed on the table and the test tube is brought as close as possible to the cell phone’s antenna. The cell phone’s number is dialed from another phone and the cell phone is left to ring continuously for 2 minutes. After 2 minutes, the temperature of the water is measured and recorded in the table given below.
5. Procedures 3 and 4 are repeated using cell phones from the other 2 manufacturers. The water temperatures are measured and recorded in the table given below.
Basic safety requirements