Sunday, 11 January 2015

Variables and Hypothesis

Hypothesis

The hypothesis is that sound travels faster when temperature increases.
Temperature is a condition that affects the speed of sound. Heat, like sound, is a form of kinetic energy.
The hypothesis is base on the theory that molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel faster. 

Variable

    • Independent Variable
      • Temperature
    • Constant Variable
      • Distance of the sound travel (distance between the sensor and reflector/cover)
      • Ping - program is set to send out 1 HIGH output per iteration
      • humidity(we asume constant/negligible)
    • Dependent Variable
      • pingTime - Time taken for a ping(output:HIGH) to travel from sensor to cover and back to the receiver again.

    Research questions

    Our 3 research questions

    1)Can UV rays kill bacteria and it so at what intensity?


    2)Does temperature affect the speed of sound?


    3)Can we use water as a source of energy

    What we chose

    Does temperature affect the speed of sound?