HW 10-2: (423)1-4; (432)8,9,14,18

HW 10-2: (423)1-4; (432)8,9,14,18

HW 10-2: (423)1-4; (432)8,9,14,18

If l is cut in half, f is doubled and v is unchanged. v = l f l and f play off each other, while v is fixed by the medium

The ground is a “solid” while air around your ears is a “gas.” Sound travels faster in solids than it does in air. Sound waves are compression waves and require a medium to vibrate through. This is fast for a solid with its closely packed rigid particles compared to random & spread out arrangement of gas particles.

An increase of 80 dB to 90 dB represents an increase by ten times in terms of energy rate that gets turned into sound (intensity). So we could add nine for a total of ten machines.

HW 10-2: (423)1-4; (432)8,9,14,18

a)  similar to a lawn mower – 90dB b)  a whisper or a quiet whisper –

20-30dB c)  similar to rustling leaves – 10dB d)  below “busy traffic” similar to

AC at 6m – 60dB