Unit 7- The E/M Spectrum

Question 1

How are mechanical waves created?

Answer 1

Vibration

Question 2

Are mechanical waves transverse or longitudinal?

Answer 2

Both

Question 3

True or false: mechanical waves carry energy

Answer 3

True

Question 4

What does a mechanical wave require to be classified as a mechanical wave?

Answer 4

A medium

Question 5

Is light a mechanical or an electromagnetic wave?

Answer 5

Electromagnetic

Question 6

Produced when an electric charge vibrates up and down or accelerates

Answer 6

Electromagnetic wave

Question 7

What are the two parts that make up an electromagnetic wave?

Answer 7

Electric field and magnetic field

Question 8

True or false: the electric and magnetic field regenerate eachother

Answer 8

True

Question 9

True or false: electromagnetic waves needs a medium to travel through

Answer 9

False

Question 10

What type of energy do electromagnetic waves carry?

Answer 10

Radiation energy

Question 11

What is the speed of sound?

Answer 11

343 M/s

Question 12

What is the speed of light?

Answer 12

300,000,000 M/s or 3x10(8)

Question 13

Both sound and light use what equation?

Answer 13

Wave equation V=f(wavelength)

Question 14

Who is Michelson?

Answer 14

Accurately measured the speed of light

Question 15

Who is Newton?

Answer 15

Proposed light travelled as a particle

Question 16

Who is Young?

Answer 16

Discovered interference and saw that it happens with waves, so light must be a wave

Question 17

Who is Einstein?

Answer 17

Found the photoelectric effect

Question 18

How do photons travel?

Answer 18

In all directions away from light, they spread out a way from the source.

Question 19

Who is Herschel?

Answer 19

First guy to study the E/M spectrum

Question 20

Is red or blue light warmer?

Answer 20

Red light

Question 21

What is a Radio Wave?

Answer 21

Longest wavelength, but shortest frequency

Question 22

What are TV waves?

Answer 22

Radio waves that also carry info for pictures.

Question 23

What are Microwaves?

Answer 23

Highest frequency radio waves, cell phones use microwaves.

Question 24

What is Radar?

Answer 24

Uses short burst of radio waves, then they change frequency when they hit objects and bounce back.

Question 25

What is Infrared (IR)?

Answer 25

Invisible to the human eye, if objects are hot they give off more IR.

Question 26

What is Visible light?

Answer 26

The only part of the EM spectrum we can see.

Question 27

What is Ultraviolet light?

Answer 27

Bad for skin in large doses, can cause cancer.

Question 28

What is X-ray?

Answer 28

High energy to penetrate objects, see inside human body.

Question 29

What is Gamma?

Answer 29

Highest energy waves and frequency, lowest wavelength. Used to kill cancer cells.

Question 30

What materials can be classified as?

Answer 30

Transparent, translucent, opaque

Question 31

What is transparency?

Answer 31

Let's all light through

Question 32

What is Translucent?

Answer 32

Let's some light through, make objects look "fuzzy"

Question 33

What is opaque?

Answer 33

Doesn't let any light through.

Question 34

What happens when a light strikes a material?

Answer 34

Reflected, absorbed or transmitted.

Question 35

How is light reflected?

Answer 35

Takes parallel light rays and reflects them in predictable ways.

Question 36

How is light transmitted?

Answer 36

Refraction, polarization and scattering

Question 37

What's refraction?

Answer 37

Rays of light bend

Question 38

What is white light consisted of?

Answer 38

All the colors, (ROYGBIV).

Question 39

What is polarization?

Answer 39

Unpolarized light vibrates in all directions, then polarized light chops off the vibrations.

Question 40

If an object is red, what colors are absorbed?

Answer 40

Every color but red.

Question 41

What happens when you send light through a prism?

Answer 41

It refracts/bends.

Question 42

What is Dispersion?

Answer 42

When light bends/refracts.

Question 43

Primary colors for mixing light?

Answer 43

Red, Green, Blue

Question 44

Secondary colors for mixing lights?

Answer 44

Cyan, Magenta, Yellow

Question 45

How is light made?

Answer 45

Electrons jump energy levels after absorbing energy. They emit photons.

Question 46

What are incandescent bulbs?

Answer 46

Regular bulbs, argon doesn't react with the filament allowing it to last a long time.

Question 47

What is Filament?

Answer 47

Thin coil of wire that gets very hot when electrons pass through

Question 49

What is in the inside of a fluorescent bulbs?

Answer 49

Phosphors that emits light.

Question 50

What is laser light?

Answer 50

The light is coherent.

Question 51

What is neon light?

Answer 51

He (pink), Ne (red), Krypton (violet)

Question 52

What are sodium vapor lights?

Answer 52

Very bright and efficient, usually street lights

Question 53

What are tungsten-halogen lights?

Answer 53

Like incandescent bulbs, with different gases.