1. The decibel scale measures sound intensity. Explain clearly what sound intensity measures using scientific terminology. Is a 60dB sound twice as loud as a 30 dB sound? If not, what would the difference be?
2. The speed of sound combined with the reflection of sound waves creates echoes. What is "echo-location"? How do bats use echoes? Ships? Doctors? Fishermen?
3. Explain the Doppler Effect. How would a Highway Patrolman use the Doppler Effect in the course of his job?