Topic 4 & 5 - Waves And EM Spectrum

Question 1

What is a wave’s amplitude?

Answer 1

Height of the wave

Question 2

What is wavelength?

Answer 2

Distance between 2 corresponding points

Metres

Question 3

Define frequency

Answer 3

How many waves pass by every second

Hz
(1/period in seconds)

Question 4

What is the speed of sound?

Answer 4

300 000 000 m/s

Question 5

Define what a TRANSVERSE WAVE is

Answer 5

Displacement is at a right angle to direction of wave

Question 6

Define what a LONGITUDINAL WAVE is

Answer 6

Displacement is parallel to direction of wave

Question 7

What is rarefaction?

Answer 7

Reduction of a wave’s density

Question 8

What is compression?

Answer 8

A longitudinal wave propagated by an elastic force

Question 9

Define the CREST of a wave

Answer 9

Point at which the wave is at max. height

Question 10

What is the TROUGH?

Answer 10

Lowest point for a wave

Question 11

What is the wave velocity?

Answer 11

Speed and direction of a wave

Question 12

What is the WORD equation for wave speed?

Answer 12

Wave speed = frequency x wave length

Question 13

What is the SYMBOL equation for wave speed?

Answer 13

V = f x h

M/s = Hz x m

Question 14

What is the alternate equation for wave speed?

Answer 14

Wave speed = distance / time

M/s = m / s

Question 15

How do you measure the speed of water ripples using a strobe light?

Answer 15

A wave pattern is shown by the wave crests

Measure the distance between the lines and how many pass every second

Question 17

When does refraction take place?

Answer 17

When a wave crosses an interface between 2 different materials
(E.g. air to glass, glass to air)

Question 18

At what degree does the normal line have to be drawn at to the surface of the material?

Answer 18

90 degrees to the surface

Question 19

What is refraction?

Answer 19

THE CHANGE OF SPEED AND CHANGE OF DIRECTION

Question 21

What are ELECTROMAGNETIC WAVES?

Answer 21

Transverse

A spectrum of light waves

Question 22

What is the order of the rainbow colours?

Answer 22

Red
Orange
Yellow
Green
Blue
Indigo
Violet

Question 23

Which light can human eyes detect?

Answer 23

Visible light

Question 24

What is the order of the EM Spectrum?

Answer 24

Gamma rays
X rays
Ultraviolet
Visible
Infrared
Microwaves
RAdiowaves

Question 25

What is the origin of gamma rays?

Answer 25

Gamma decay

Question 26

What is the origin of x rays?

Answer 26

Discovered: 1895 by Roentgen

Question 27

What is the origin of visible light?

Answer 27

Vibrations of charged particles

Question 28

What is the origin of infrared light?

Answer 28

Thermal radiation discovered by Herschel

Question 29

Who discovered microwaves?

Answer 29

Percy Spencer

Question 30

Who discovered radiowaves?

Answer 30

James Clara

Question 31

How do you detect gamma rays?

Answer 31

Semi conductor

Question 32

How do you detect x rays?

Answer 32

Scintillator detector

Question 33

How do you detect ultra violet?

Answer 33

A solid state device

Question 34

How do you detect infrared light?

Answer 34

Thermal detection

Question 35

How do you detect micro waves?

Answer 35

Magnetron

Question 36

How do you detect radio waves?

Answer 36

With a receiver

Question 37

How are gamma rays used?

Answer 37

Medicinal or treatment for diseases like cancer

Question 38

What are the uses of x rays?

Answer 38

To produce negative images of skeletal structures

Question 39

What are uses of ultraviolet?

Answer 39

To detect fake money

Question 40

What are uses infrared? | 3

Answer 40

Cooking Remote controls Security systems

Question 41

What are uses of micro waves? | 3

Answer 41

Cooking Mobile phones Satellite

Question 42

What are uses of radio waves?

Answer 42

Communications

Question 43

What are dangers of gamma rays?

Answer 43

Penetrates skin and damages cells | To kill microbes and sterilise

Question 44

What are dangers of x rays?

Answer 44

Radiation exposure can cause cell mutations

Question 45

What are dangers of ultraviolet?

Answer 45

Can damage eyes and skin

Question 46

What are dangers of infrared?

Answer 46

Skin burns / damage

Question 47

What are dangers of microwaves?

Answer 47

Radiation exposure

Question 48

What are risks involved with radio waves?

Answer 48

Cancerous risks

Question 49

Which light on the EM Spectrum is just too high for our eyes to detect?

Answer 49

Ultraviolet light

Question 50

Which light is just too low for our eyes to detect?

Answer 50

Infrared

Question 61

Waves with high frequencies have...

Answer 61

Short wavelengths

Question 62

Waves with low frequencies have...

Answer 62

long wavelengths

Question 63

How much did each colour’s temperatures rise by Herschel’s experiment in discovering infrared?

Answer 63

Blue = 6 degrees Yellow = 9 degrees BEYOND RED = 11 degrees (infrared)