1. How does a noise sound when its frequency is increased? When its amplitude is increased? 2. In what direction do sound waves traveling north cause the air particles over which they pass to vibrate? Is sound a transverse or a longitudinal wave? 3. Compare the speed in air of two sounds, one of frequency 200 Hz and the other of 400 Hz. 4. Why does sound travel faster in water than in air? Why does sound not travel at all in space? 5. A girl hears her echo return from a wall 10.0 s after shouting "Boo!" If the speed of sound is 330 m/s, then how far is the girl from the wall? 6. The speed of sound increases by 0.6 m/'s for every degree Celsius rise in temperature: v = 331 m/s + (0.6 m/s."C).T A soldier hears the firing of a distant cannon 6.00 seconds after seeing the flash. If the temperature is 20"C, how far is the soldier from the cannon? 7. In the longitudinal wave shown below, which two points are one wavelength apart? Wave Motion