Electromagnetic Spectrum

Question 1

Radio Waves Frequency?

Answer 1

300,000 - 3000million Hz

Question 2

Radio Wave wavelength?

Answer 2

1 - 10(4) m

Question 3

How are Radio Waves produced?

Answer 3

They can be produced by oscillations in electrical circuits.

Question 4

Radio wave effect on humans?

Answer 4

Humans (and most buildings) are transparent to them.

Question 5

What do Radio Waves travel through?

Answer 5

Travel through all of the atmosphere. All of them can be bounced by a series of transmitters and receivers.

Question 6

Uses of Radio Waves?

Answer 6

• Bluetooth enabled devices
• TV
• Radio

Question 7

Microwave Frequency?

Answer 7

10(10) - 10(11) Hz

Question 8

Microwave Wavelength?

Answer 8

10(-1) - 10(-3) m

Question 9

What happens to Microwaves?

Answer 9

They can be transmitted through the atmosphere.

Question 10

Microwave effect on Humans?

Answer 10

They are absorbed very slightly by humans.

Question 11

How does food in a microwave get cooked?

Answer 11

The water molecules in food absorb them, which makes them vibrate more vigorously and therefore heat up.

Question 12

Microwaves’ relationship with materials

Answer 12

• Metal reflects them

- Glass and Plastic are transparent to them

Question 13

What are Microwaves used for?

Answer 13

• Satellite communications

- Cooking food

Question 14

Infra-Red Frequency?

Answer 14

10(12) - 10(14) Hz

Question 15

Infra-Red wavelength?

Answer 15

10(-3) - 10(-6)m

Question 16

What is Infra Red emitted by?

Answer 16

Hot/Warm objects

Question 17

Infra Red relationship with materials?

Answer 17

• Reflected by shiny surfaces

- It will travel through transparent materials

Question 18

What is Infra-Red used for?

Answer 18

• Electric Heaters
• Cooking Food
• Remote control handsets

Question 19

Visible Light frequency?

Answer 19

10(15)Hz

Question 20

Visible Light wavelength?

Answer 20

10(-6)

Question 21

Visible Light effect on humans?

Answer 21

Strongly absorbed by humans, but safe.

Question 22

Uses of visible Light?

Answer 22

• Fibre Optic communications

- General communications

Question 23

Ultraviolet Frequency?

Answer 23

10(15) - 10(17) Hz

Question 24

Ultraviolet wavelength ?

Answer 24

10(-7) - 10(-8)m

Question 25

Ultraviolet effect on humans?

Answer 25

They are absorbed by our bodies

Question 26

Which wavelength can damage the human body?

Answer 26

The shortest wavelength rays can do damage by ionising atoms in skin tissues.

Question 27

What can ultraviolet rays cause?

Answer 27

• The skin to tan

- Skin cancer

Question 28

Ultraviolet rays are used for?

Answer 28

• Sun tanning

- Energy Efficient lamps

Question 29

Frequency of X-Rays?

Answer 29

10(17) - 10(19)Hz

Question 30

X-Rays Wavelength?

Answer 30

10(-8) - 10(-10)m

Question 31

X-Ray effect on humans?

Answer 31

• Soft tissue of our bodies are transparent to them.
• Bones absorb some radiation
• They dab ionise tissue atoms

Question 32

Uses of X-Rays?

Answer 32

Medical imaging and treatment

Question 33

What can X-Rays cause?

Answer 33

Ionising radiation can cause the the mutation of genes and cancer.

Question 34

Frequency of Gamma Rays?

Answer 34

10(19) - 10(20)Hz

Question 35

Wavelength of Gamma Rays?

Answer 35

10(-11) - 10(-12) m

Question 36

Where are Gamma rays generated?

Answer 36

Changes in atoms and the nuclei of atoms can result in electromagnetic waves being generated or absorbed over a wide frequency range

Question 37

What can Gamma Rays cause?

Answer 37

Cancer in all parts of the body

Ionising radiation can cause mutation of genes.

Question 38

Gamma Rays’ effect on human body?

Answer 38

• They pass through the skin

- Can damage/kill cells

Question 39

Uses of Gamma Rays?

Answer 39

Medical imaging and treatment

Question 40

What happens as you go down the electromagnetic spectrum?

Answer 40

The frequency gets higher, the wavelength gets shorter

Question 41

What type of Waves are they?

Answer 41

Example of transverse Waves

Question 42

What speed do all these Waves travel at?

Answer 42

The speed of light

3x10(8)