Input/Output of the Summary of Chapter 2 Section 1 and 2

Section 1:

Sound is a disturbance that travels through a medium as a longitudinal wave; the speed of sound depends on the elasticity, density, and temperature of the medium. Since sound is a transfer of energy, its speed depends on how well the particles in the medium bounce back after being disturbed. I learned that Elasticity is the ability of a material to bounce back after being disturbed (like echo for the sound). Also the density of a medium is how much matter, or mass, there is in a given amount of space, or volume.

*Sound can also travel through solids and liquids...

Section 2:

The intensity of a sound wave is the amount of energy the wave carries per second through a unit area. Loudness describes what you actually hear. It is measured in watts per square meter (w/m to the second power). The greater the intensity of a sound wave, the louder it is. Loudness or sound level is measured in decibels. Sound waves with frequencies above the normal human range of hearing are called ultrasound. Sounds with frequencies below the normal human range of hearing are called infra-sound As a sound source moves toward the listener, the waves reach the listener with a higher frequency. The pitch appears to increase because of the Doppler effect.