1) Two tuning forks will be in resonance if they are tuned to the ______________ frequency.

2) If the two tuning forks are tuned to slightly different frequencies we will hear the effect of ___________.

3) One evening while camping on a lakeshore you hear clearly the conversation of other campers across the lake. You figure that the air close to the water surface ________________, because sound travels more slowly in colder air than in warmer air.

4) A guitar string produces a fundamental frequency of 220 Hz. What will be the frequency if you reduce the length 2 times?