Chapter 9 TEST

Question 1

Waves are caused by something that

Answer 1

vibrates

Question 2

waves transmit/carry

Answer 2

energy

Question 3

what are the 2 types of waves

Answer 3

compressional and transverse

Question 4

some waves need a ___ to transfer energy and some do not

Answer 4

medium

Question 5

main example of longitudinal/compressional wave is a

Answer 5

sound wave

Question 6

transverse wave examples

Answer 6

radio waves, microwaves, infrared waves, light waves, ultraviolet waves, x-rays, gamma rays, water waves

Question 7

amplitude

Answer 7

the distance from the centre line (or the still position) to the top of a crest OR to the bottom of a trough

Question 8

frequency

Answer 8

the rate at which something occurs or is repeated over a particular period of time or in a given sample.

Question 9

period

Answer 9

length or portion of time

Question 10

wavelength

Answer 10

the top point from one crest to another identical one

Question 11

reflection

Answer 11

when a wave strikes an object, and the wave bounces off the object

Question 12

refraction

Answer 12

bending of a wave caused by a change in a waves speed as it travels at an angle from one type of of medium to another type of medium

Question 13

diffraction

Answer 13

bending of a wave around a barrier or through a opening

Question 14

interference

Answer 14

when two or more waves overlap and combine to form a new wave

Question 15

natural frequency

Answer 15

the frequency at which an object will vibrate if acted on by an outside force

Question 16

law of reflection

Answer 16

the incident ray, the reflected ray, and the normal to the surface of the mirror all lie in the same plane

Question 17

incidence beam

Answer 17

the first beam going onto the mirror

Question 18

reflected beam

Answer 18

the beam leaving the mirror

Question 19

normal line

Answer 19

the line that is perpendicular of where the incidence beam meets the mirror

Question 20

wave velocity formula

Answer 20

v=wavelength * f

Question 21

units for velocity, frequency, wavelength, period of a wave

Answer 21

velocity- meters/second
frequency- hertz (hz)
wavelength- anything meter
period of a wave- seconds

Question 22

what 3 factors affect an objects natural frequency

Answer 22

its size, structure, weight and shape.

Question 23

Refraction causes the waves to do what/

Answer 23

travel through

Question 24

diffraction causes the waves to do waht?

Answer 24

travel around

Question 25

what are the speeds of the waves in refraction

Answer 25

short wavelengths= refract more long wavelengths= refracts less

Question 26

what are the speeds of the waves in diffraction?

Answer 26

short wavelengths= diffract less long wavelengths= diffract more

Question 27

what kind of wavelength is sound?

Answer 27

long

Question 28

light is a _____ wavelength

Answer 28

short

Question 29

if the wave speeds up it refracts ____ ____ the normal

Answer 29

away from

Question 30

if the wave slows down it refracts __ the normal

Answer 30

to

Question 31

constructive interference

Answer 31

crest and troughs line up perfectly with more crest and troughs; they will COMBINE energy and become a bigger wave

Question 32

destructive interfernce

Answer 32

the crest lines up perfectly with the trough; they will cancel each other out.

Question 33

any time constructive or destructive interference happen, what happens?

Answer 33

a new wave forms