PHY 2020 Lecture Notes - Lecture 20: Tuning Fork, Sound, Oscilloscope
Document Summary
Figure 20. 1: (a) when the door is opened, compression travels across the room. (b) when the door is closed, a rarefaction travels across the room. Figure 20. 2: compression and rarefactions travel (both at the same speed in the same direction) from the tuning fork through the air in the tube. Figure 20. 3: a ping-pong paddle vibrating in the midst of ping-pong balls produces vibration of the balls: low pressure behind, high pressure in front. Figure 20. 4: waves of compressed and rarefied air, produced by the vibrating cone of the loudspeaker, make up the pleasing sound of music. Suppose a sound wave and an electromagnetic wave have the same frequency. The light wave because it has a higher velocity. The speed of light is faster than sound. 20 hz-20, 000 hz: older people vibrissae"s get stiffer thus the higher frequency range is lost. Both carpet and snowfall have air within them.
