Waves & The Em Spectrum

Front 1

Which one has larger amplitude, top or bottom?

Back 1

bottom

Front 2

Which one has higher frequency, top or bottom, or are they the same?

Back 2

Same frequency. The troughs and crests line up.

Front 3

Which is a frequency modulated wave, the top or bottom one?

Back 3

bottom

Front 4

Which number indicates the amplitude?

Back 4

#3

Front 5

Which number indicates the wavelength?

Back 5

#1

Front 6

What type of EM (electromagnetic) radiation causes sunburn?

Back 6

UV

Front 7

What type of EM radiation makes up white light?

Back 7

visible light waves

Front 8

What type of EM radiation is used to broadcast television signals?

Back 8

radio waves

Front 9

What does AM stand for?

Back 9

amplitude modulation

Front 10

How are EM waves different from every other wave type?

Back 10

They can travel through space. They don't need a medium like air or water to travel through.

Front 11

Which EM wave has the lowest frequency?

Back 11

radio waves

Front 12

Which EM wave has the highest frequency?

Back 12

gamma rays

Front 13

Why does an object appear blue?

Back 13

The object is absorbing all other light colors except for blue, which it is reflecting.

Front 14

Vocab: a change in the direction of light as it bounces of a surface

Back 14

reflection

Front 15

Vocab: the distance from midpoint of the wave to the crest or the trough

Back 15

amplitude

Front 16

Vocab: the bending of light from one transparent medium to another

Back 16

refraction

Front 17

Vocab: a disturbance that move energy through matter or space

Back 17

wave

Front 18

Which EM waves can be dangerous to humans?

Back 18

UV, x-rays, gamma rays. All rays above the visible spectrum.

Front 19

As the energy of wave increases, what happens to its frequency?

Back 19

It increases.

Front 20

Which visible color of light has the longest wavelength and the least energy?

Back 20

red

Front 21

What is the only part of the EM spectrum that we can see?

Back 21

visible light

Front 22

Why can't sound travel in space?

Back 22

It needs air as a medium and there is none.

Front 23

What type of EM wave travels the fastest?

Back 23

They all travel at the same speed, the speed of light. Their frequency is what differs.

Front 24

What is the frequency of this wave is this is one second's worth?

Back 24

2 1/2

Front 25

What does FM stand for on a radio dial?

Back 25

frequency modulated

Front 26

Is this an AM or FM wave?

Back 26

AM - amplitude modulated. The amplitude is what is changing.

Front 27

Vocab:

this is the number of waves passing a point each second

Back 27

frequency

Front 28

Vocab:

this is the distance from any point on a wave to an identical point on the next wave

Back 28

wavelength

Front 29

Which of the 3 has the longest wavelength?

Back 29

the top one

Front 30

What EM wave type is used by cell phones?

Back 30

microwaves

Front 31

What EM wave type is used to treat cancer?

Back 31

gamma rays

Front 32

What EM wave type is used to see inside things?

Back 32

x-rays

Front 33

What EM wave makes whatever it strikes feel warmer?

Back 33

infrared

Front 34

Name a type of wave that isn't on the EM spectrum.

Back 34

water wave or

sound wave

Front 35

Refraction can separate white light into

a. infrared waves.

b. different colors.

c. UV light.

d. longer wavelengths.

Back 35

b. different colors

Front 36

What visible color of light has the longest wavelength and least amount of energy?

Back 36

red

Front 37

What is the acronym for visible light in order from shortest wavelength to longest wavelength?

Back 37

ROY G BIV

Front 38

If the angle of reflection is 30 degrees, what is the angle of incidence?

Back 38

30 degrees

Front 39

What does the law of reflection say?

Back 39

The angle of incidence is equal to the angle of reflection in a beam that is reflecting off of a surface.

Front 40

Where is the sun when you see a rainbow in the sky?

Back 40

Off to the side behind you.

Front 41

All frequencies of light waves together in the visible spectrum create what color of light?

Back 41

white light

Front 42

Refraction separates white light into what?

Back 42

all colors of the visible spectrum

Front 43

Why does a pencil look broken when it is placed standing up in a glass of water?

Back 43

Because the light waves from the part of the pencil in the water are bending, making it look like that part of the pencil is in another place.

Front 44

What does a high index of refraction mean?

Back 44

Light waves bend a lot when they travel through the material. (ex. diamond has one of the highest and so is very sparkly)

Front 45

Name a reason why sending information by digital signals is better than sending it by analog signals.

Back 45

Digital signals do not experience interference like analog signals do.

Front 46

Fiber optics allows information to be sent quickly using pulses of light. The information must first be converted into a ____________ signal.

Back 46

digital

Front 47

Vocab: to relay something to another place

Back 47

to transmit

Front 48

to put into a code

Back 48

to encode

Front 49

a signal represented by a continuous wave (not pulses)

Back 49

an analog signal

Front 50

waves in the form of a digital signal

Back 50

a wave pulse

Front 51

a signal that uses numbers

Back 51

a digitized signal