Ch 6: Waves (in progress)

Question 1

which phase of matter?

• particles are linked in place
• has definite size
• has definite shape
• keeps its shape in a container

Answer 1

solid

Question 2

which phase of matter?

• particles “slip and slide”
• has definite size
• has no definite shape
• takes the shape of a container

Answer 2

liquid

Question 3

which phase of matter?

• particles move independently
• have no definite size
• have no definite shape
• completely fills a container

Answer 3

gas

Question 4

phase of matter which is a “soup” of charged particles

example: the sun

Answer 4

plasma

Question 5

the propogation of energy through a medium

Answer 5

wave

Question 6

a wave where the particles of the medium move perpendicular to the direction of the wave examples: flags flying, crowds doing “the wave” at sporting events

Answer 6

transverse wave

Question 7

a wave where the particles of the medium move parallel to the direction of the wave

Answer 7

longitudinal wave

Question 8

the distance required to complete one cycle (from peak to peak, or valley to valley)

Answer 8

wavelength

Question 9

the time required to complete one cycle

Answer 9

period

T

Question 10

the number of cycles per second

Answer 10

frequency

Question 11

the maximum distance from the mid-line

Answer 11

amplitude

Question 12

amplitude modulation (radio)

Answer 12

AM

Question 13

frequency modulation (radio)

Answer 13

FM

Question 14

ocean waves are a combination of…?

Answer 14

transverse and longitudinal waves

Question 15

the unit for frequency is:

Answer 15

Hertz (Hz)

Question 16

equation: frequency

Answer 16

frequency is one over period

Question 17

equation: wave velocity

Answer 17

wave velocity is wavelength over period -or- wavelength times frequencynote: always include direction of a.f.s. (away from source) in answer

Question 18

waves of energy given off when a charged particle vibrates

Answer 18

electromagnetic (EM) waves

Question 19

the little part of the EM spectrum we can see

Answer 19

visible light

Question 20

longitudinal waves through matter

Answer 20

sound

Question 21

below 20 Hz

Answer 21

infrasound

Question 22

above 20 KHz

Answer 22

ultrasound

Question 23

the perceived highness of a sound

Answer 23

pitch

Question 24

power per unit area of sound

Answer 24

intensity

Question 25

the logarithmic scale of sound intensity

Answer 25

decibel

Question 26

some facts about EM waves?

Answer 26

• they’re transverse
• they have an electric and magnetic component
• the components are at right angles
• they travel @ the speed of light (in a vacuum)
• they don’t need a carrier (like radiation)

Question 27

examples of EM waves?

Answer 27

• radiowaves
• infrared
• ultraviolet (UV)
• x-rays
• microwaves
• gamma rays

Question 28

range of visible light known as deep red

Answer 28

wavelength = 700 nm

F = 3.8 x 10^14 Hz

Question 29

range of visible light known as deep blue

Answer 29

wavelength = 390 nm

F = 7.7 x 10^14 Hz

Question 30

the range of human hearing is?

Answer 30

20 Hz to 20 kHz

Question 31

how is pitch different from frequency?

Answer 31

frequency is measured; pitch is “a matter of opinion” (i.e., subjective)

Question 32

how is intensity different from loudness?

Answer 32

intensity is measured; loudness is “a matter of opinion” (i.e., subjective)

Question 33

what phase does sound travel fastest through?

Answer 33

solids

Question 34

examples of low-pitched sounds?

Answer 34

rolling thunder, a foghorn

Question 35

the linear scale units of sound intensity

Answer 35

W/m² (watts per meter squared)

Question 36

the threshold of hearing

Answer 36

0 dB

Question 37

the threshold of pain

Answer 37

120 dB

Question 38

equation: intensity

Answer 38

second intensity over first intensity is = to the square of the first distance over the second distance (inverse relationship)