practice

1. Write something.
2. Write something else.
3. Write something different.
4. Write something completely different.

numerical

1. A sound wave traveling through air at STP has a frequency of 1000 Hz.
   1. What is its period?
   2. What frequency would this same wave have in water (speed of sound in water, 1500 m/s)?
   3. What frequency would this same wave have in steel (speed of sound in steel, 5000 m/s)?