Ch.2 UUP

true or false can sound travel through a vacuums?

• true sound can travel through anything

• false sound cannot travel through a vacuums

Answer explanation

sound needs a medium to travel ,

in a vacuums there is no medium

what is acoustic propagation

• how the medium affects the sound wave

• how the sound wave affects the medium

what are the three acoustic variables

• pressure

• density

• time

• distance

Answer explanation

they are used to distinguish between sound waves and other type of waves

how do you measure pressure

• kg/cm^3

  kilograms per centimeter cubed

• (Pa)

  pascals

• (cm)

  centimeters

• (in)

  inches

Answer explanation

concentration of force in an area

how do you measure density

• ft

  feet

• Pa

  pascals

• cm

  centimeters

• kg/cm^3

  kilograms per cm cubed

Answer explanation

concentration of mass in volume

how do you measure distance

• sec

  seconds

• mile

• cm

  centimeters

• ft

  feet

Answer explanation

measure of particles in motion

sound waves are what kind of wave

• longitudinal waves

  moving left to right

• transverse waves

  moving up and down

which wave is In-phase

• 1.

• 2.

• 3.

Answer explanation

waves that are In- phase reach their maximum values at the same time and their minimum values at the same time

which waves are out-of-phase

• 1.

• 2.

• 3.

Answer explanation

waves that are out of phase are waves that dont have a set time for anything

what happens during constructive interference

• two out of phase waves merge and cancel each other out

• two in phase waves merge to become one big wave

• two in phase waves merge and become small

Answer explanation

interference happens when two waves arrive at the same spot and merge to become 1 wave

during constructive interference both in phase waves join to make one big wave