1. Dolphins can produce sound waves with frequencies ranging from.25 kHz to 220 kHz, but only those at the upper end of the spectrumare used in echolocation. Explain why high frequency waves workbetter than low frequency waves.
2. When the decibel of traffic in the street goes from 40 to 60 dB,
a. How much louder does the traffic noise seem?
b. How much greater is the intensity?