P1 - topic 2 - Electromagnetic Waves

Question 1

what is the order of the electromagnetic spectrum?

Answer 1

radio waves 
micro waves 
infrared 
visible light
ultra violet 
X-rays
gamma rays

Question 2

the EM waves are shown with their what?

Answer 2

wavelength

Question 3

which EM wave has the smallest wavelength?

Answer 3

gamma rays

Question 4

which EM wave have he smallest frequency?

Answer 4

radio waves

Question 5

all EM waves are transverse/longitudinal?

Answer 5

transverse

Question 6

all the different types of EM waves travel at the same speed or at different speeds in a vacuum?

Answer 6

the same

Question 7

what speed do waves travel at in a vacuum?

Answer 7

3x20(8) m/s

Question 8

give an example of a vacuum

Answer 8

space

Question 9

EM waves like X-Ray’s and gamma rays and high frequencies but short what?

Answer 9

wavelength

Question 10

who discovered infrared and when did they discover it?

Answer 10

Herschel in 1800

Question 11

up until the discovery of infrared radiation, what was the only EM wave that scientists knew existed?

Answer 11

visible light

Question 12

What did Herschel use to discover infrared?

Answer 12

a prism and sunlight

Question 13

when light goes through a prism, what does it create?

Answer 13

a spectrum of colours

Question 14

Herschel used a prism and sunlight to create a ……. on a …….

Answer 14

spectrum

screen

Question 15

What did Herschel want to know about each of the colours in the spectrum?

Answer 15

the amount of heat in each of them

Question 16

What did Herschel use to measure the heat in each of the colours in the spectrum?

Answer 16

a thermometer

Question 17

what did Herschel notice about the temperature of the colours?

Answer 17

they increased from violet to red

Question 18

When Herschel discovered the temperature increase from violet to red, what did he do next?

Answer 18

measure the temperature just last the red part of the spectrum where there’s no visible light

Question 19

When Herschel measured the temperature just past the red part of the spectrum what did he find?

Answer 19

that there had the highest temperature of all

Question 20

is infrared an visible or invisible type of radiation?

Answer 20

invisible

Question 21

Who discovered ultraviolet radiation at when did they?

Answer 21

Ritter in 1801

Question 22

What was Ritter trying to discover?

Answer 22

if there was anything of the other side of the spectrum beyond violet

Question 23

What did Ritter know about silver chloride?

Answer 23

it turned from white to black when exposed to sunlight

Question 24

What did Ritter measure?

Answer 24

How quickly silver chloride coated strips changed when exposed to different colours of light (the spectrum)

Question 25

How did Ritter measure how quickly the silver chloride coated strips changed colour?

Answer 25

in a dark room, he created a spectrum using a light source and a prism and exposed the strips of paper to each colour. He timed how long it took the strips to turn black

Question 26

A what end of the spectrum changed the stops the quickest when exposed to light?

Answer 26

blue

Question 27

When Ritter discovered that the blue end of the spectrum changed the strips the quickest, what did he do?

Answer 27

He pleaded a trip in the area just past the violet part of the spectrum

Question 28

What did Ritter discover when he place a strip just past the violet part of the spectrum?

Answer 28

he saw the quickest change of all

Question 29

Is ultraviolet radiation an visible of invisible form of light that exists on the other side of the spectrum?

Answer 29

invisible light

Question 30

how many EM waves are there?

Answer 30

7

Question 31

What is the order of the colours in a spectrum?

Answer 31

``` red orange yellow green blue indigo violet ```