Question

- You have three televisions on playing three different FIFA world cup games. Each of the televisions has an output of 62 dB SPL. What is the combined SPL of all three of the televisions?

-You purchased a new set noise-cancelling headphones to wear on your plane ride to Hawaii last month. The intensity of the background noise on the plane (prior to wearing the headphones) was 4 x 10-2 w/m2. When wearing the headphones, the intensity of the noise was reduced to 2 x 10-3 w/m2. How much noise reduction (in dB) did the headphones provide?

Answer 1