Intensity

At a distance of 30 m the noise from the engine of an jet has an intensity of 130 dB. At this level, you will be in pain and your ears will hurt. That's why this intensity is know as the "pain threshold". How far do you have to be from a jet (total distan...

While blowing its horn of frequency 580 Hz, a car accelerates at 0.4 m/s2. The car starts from rest by your side and moves away. How long will it take for the frequency you hear to decrease by 5%? Hint: Do not forget to include the time it will take for s...