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Physics > EM Spectrum > Flashcards

EM Spectrum Flashcards

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0
Q

As wavelength increases

A

Frequency decreases and vice versa

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1
Q

Light is part of a what electromagnetic spectrum

A

Continuous

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2
Q

Speed =

A 
Speed = Frequency x wavelength
M/s = Hz x m 
V = F (lambda)
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3
Q

Highest to lowest frequency of the EM spectrum

A 
Gamma rays
X-rays
Ultra - violet (UV) 
Visible light 
Infra-red (IR)
Microwaves
Radio waves
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4
Q

4 similarities that all parts of the EM spectrum share

A
  • 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
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5
Q

What features make groups of electromagnetic waves different from others

A

Wavelength and frequency

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6
Q

Gamma ray uses

A

Sterilising equipment and food

Radiotherapy

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7
Q

X-ray uses

A

X-radiotherapy to observe the internal structure of objects

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8
Q

Ultraviolet uses

A

Fluorescent tubes

UV tanning lamps

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9
Q

Visible light uses

A

Seeing communication

Photography

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10
Q

Infra red uses

A

Cookers + heaters
TV + stereo remote controls
Night vision

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11
Q

Microwave uses

A

Mobile phone + satellite communication

Cooking

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12
Q

Radio wave uses

A

Long/medium/short wave radio

TV

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13
Q

Detrimental effect on the body from radio waves

A

Nil

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14
Q

Detrimental effect on the body from microwaves

A

Can heat human body tissue ie mobiles

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15
Q

Detrimental effect on the body from infra-red

A

Skin burns with too much exposure ie hot objects

16
Q

Detrimental effect on the body from visible light

A

Nil

17
Q

Detrimental effect on the body from ultra violet

A

Harmful to human eyes and skin (melanoma cancer)

18
Q

Detrimental effect on the body from x-rays

A

Cancer after many

19
Q

Detrimental effect on the body from gamma rays

A

Small dose –> mutation of cells –> becomes cancerous

20
Q

Analogue signal looks like

A

A wave

21
Q

Analogue signal the amplitude does what

A

Increases and decreases

22
Q

Digital signal the frequency does what

A

Remains the same

23
Q

What happens with the information in an analogue signal

A

Its converted into electrical voltages that vary

24
Q

What does a digital signal look like

A

Castle tops

25
Q

What happens with the information of a digital signal

A

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

26
Q

Received signals are usually

A

Attenuated

27
Q

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

A 
Weaken
Noise
Amplified 
regenerated
Clean
Accurate
28
Q

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

A

Regenerates it

removes noise

29
Q

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

A

Information
Noise
Distortion
Noise

30
Q

Speed if light

A

3 x 10 (power of 8) m/s

31
Q

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

A

Electrical

Attenuation

32
Q

Analogue signals have their noise amplified which

A

Reduces the quality of the signal

33
Q

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

A

A mobile phone mast sending a text message

34
Q

One advantage of using a digital signal

A

Can carry more information through binary code

35
Q

Two waves in the spectrum that are most harmful to humans

A

Gamma rays

X-rays

Physics (32 decks)

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