CW Thursday 21 st
May 2020
Physics Bridging Lesson 2
Investigating Sound
In my experiment, as you place the decibels meter at closer distance to the source
of noise from computer, the decibel is high, meaning very loud. But the further
the distance from the source of noise, the lower the decibels, meaning quiet
noise. This is due to inverse square law, where sound intensity is inversely
proportional to square of distance. Decibels are logarithmic unit that used to
measure sound level using decibels scale. Decibels scale are based in order of
magnitude, therefore each mark is the last mark multiplied by a value.
Overall, the further the distance from the source of noise, the lower the loudness
of decibels (sound level) because of the inverse square law. However the last
distance (50cm) is increasing, showing anomalous result. Therefore, to improve, I
need more space to decrease the decibels in 50cm distance.
