EM Spectrum

Question 0

As wavelength increases

Answer 0

Frequency decreases and vice versa

Question 1

Light is part of a what electromagnetic spectrum

Answer 1

Continuous

Question 2

Speed =

Answer 2

Speed = Frequency x wavelength
M/s = Hz x m 
V = F (lambda)

Question 3

Highest to lowest frequency of the EM spectrum

Answer 3

Gamma rays
X-rays
Ultra - violet (UV) 
Visible light 
Infra-red (IR)
Microwaves
Radio waves

Question 4

4 similarities that all parts of the EM spectrum share

Answer 4

• all transfer energy
• all are transverse waves
• all travel at the speed of light in a vacuum (300 000 000 m/s)
• all can be reflected, diffracted and refracted

Question 5

What features make groups of electromagnetic waves different from others

Answer 5

Wavelength and frequency

Question 6

Gamma ray uses

Answer 6

Sterilising equipment and food

Radiotherapy

Question 7

X-ray uses

Answer 7

X-radiotherapy to observe the internal structure of objects

Question 8

Ultraviolet uses

Answer 8

Fluorescent tubes

UV tanning lamps

Question 9

Visible light uses

Answer 9

Seeing communication

Photography

Question 10

Infra red uses

Answer 10

Cookers + heaters
TV + stereo remote controls
Night vision

Question 11

Microwave uses

Answer 11

Mobile phone + satellite communication

Cooking

Question 12

Radio wave uses

Answer 12

Long/medium/short wave radio

TV

Question 13

Detrimental effect on the body from radio waves

Answer 13

Nil

Question 14

Detrimental effect on the body from microwaves

Answer 14

Can heat human body tissue ie mobiles

Question 15

Detrimental effect on the body from infra-red

Answer 15

Skin burns with too much exposure ie hot objects

Question 16

Detrimental effect on the body from visible light

Answer 16

Nil

Question 17

Detrimental effect on the body from ultra violet

Answer 17

Harmful to human eyes and skin (melanoma cancer)

Question 18

Detrimental effect on the body from x-rays

Answer 18

Cancer after many

Question 19

Detrimental effect on the body from gamma rays

Answer 19

Small dose –> mutation of cells –> becomes cancerous

Question 20

Analogue signal looks like

Answer 20

A wave

Question 21

Analogue signal the amplitude does what

Answer 21

Increases and decreases

Question 22

Digital signal the frequency does what

Answer 22

Remains the same

Question 23

What happens with the information in an analogue signal

Answer 23

Its converted into electrical voltages that vary

Question 24

What does a digital signal look like

Answer 24

Castle tops

Question 25

What happens with the information of a digital signal

Answer 25

Its converted into a sequence of numbers called a binary code which only has 2 digits, 1 and 0, these numbers are converted into a series pf electrical pulses

Question 26

Received signals are usually

Answer 26

Attenuated

Question 27

All signals ... During transmission as they pick up electrical ... And need to be ... Or ... Regeneration of digital signals creates a ... And ... Copy of the original signal

Answer 27

``` Weaken Noise Amplified regenerated Clean Accurate ```

Question 28

When an analogue signal passes through two circuits in a communication system the first part... And the second part....

Answer 28

Regenerates it | removes noise

Question 29

A digital signal can carry more ... Than an analogue signal. ...makes a signal difficult to detect. ... Changes the shape of a signal waveform. A regenerator circuit removes ... From a digital signal

Answer 29

Information Noise Distortion Noise

Question 30

Speed if light

Answer 30

3 x 10 (power of 8) m/s

Question 31

Both analogue and digital signals pick up ... Noise during transmission the also experience ...

Answer 31

Electrical | Attenuation

Question 32

Analogue signals have their noise amplified which

Answer 32

Reduces the quality of the signal

Question 33

What sends out microwave energy, a mobile phone sending a text message or a mobile phone mast sending a text message

Answer 33

A mobile phone mast sending a text message

Question 34

One advantage of using a digital signal

Answer 34

Can carry more information through binary code

Question 35

Two waves in the spectrum that are most harmful to humans

Answer 35

Gamma rays | X-rays