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GCSE Physics > P13 - Electromagnetic Waves > Flashcards

P13 - Electromagnetic Waves Flashcards

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1
Q

Why type of waves are electromagnetic waves?

A

They are ALL transverse waves

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2
Q

Does every electromagnetic wave IN A VACUUM travel at the same speed?

A

YES

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3
Q

What speed do ALL electromagnetic waves in a VACUUM travel at?

A

300 million metres per second

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4
Q

What is inversely related in the electromagnetic spectrum?

A

The wavelength and frequency are inversely related

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5
Q

What does it mean when the wavelength and frequency are inversely related?

A

When one of them increases, the other decreases

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6
Q

What is the order of all the different waves in the spectrum

A

Radio waves, microwaves, infared, visible light, ultra violet, x-rays, gamma rays

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7
Q

What is the only electromagnetic wave humans can detect on the electromagnetic wave spectrum?

A

Visible light

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8
Q

What colours is visible light made up of?

A

Red
Orange
Yellow
Green
Blue
Indigo
Violet

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9
Q

Why can (ultra violet, x-rays and gamma rays) be dangerous to humans?

A

They are ionising which can cause damage to our cells

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10
Q

Which two waves are used for communication?

A

Radio waves
And
Microwaves

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11
Q

What electromagnetic wave has the longest wavelength and lowest frequency?

A

Radiowaves

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12
Q

What electromagnetic wave has the shortest wavelength and highest frequency?

A

Gamma rays

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13
Q

Why do we call the electromagnetic wave spectrum, electromagnetic?

A

Because its made up of oscillating electric and magnetic fields

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14
Q

How do generate radiowaves?

A

Using electricity in the form of sn alternating current

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15
Q

What are alternating currents made up of?

A

Oscillating charges

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16
Q

What are three types of radiowaves we use for communication? (Its simple)

A

Longwaves
Short waves
Very short waves

17
Q

Why do we use long waves of radiowaves for huge distances?

A

The can bend around the curved surface of the earth

18
Q

What are the two types of microwaves?

A

Waves absorbed by water molecules
and
Waves that arent absorbed by water molecules

19
Q

What are the micro waves that arent absorbed by water molecules used for?

A

Satelites for communication as the atmosphere has water

20
Q

What are the micro waves that ARE absorbed by water molecules used for?

A

Heat our food as the watermolecules in food are absorbed and vibrate

21
Q

What are the micro waves that ARE absorbed by water molecules used for?

A

Heat our food as the watermolecules in food are absorbed and vibrate

22
Q

Where is infared radiation emitted from?

A

All objects that have thermal energy

23
Q

How can visible light also be used for communication?

A

Using optical fibres (thin glass fibres) that are able to transmit pulses of light over long distances

24
Q

What is fluorescence?

A

A property of certain chemicals where ultra violet is absorbed and then visible light is emitted

25
Q

Where might you see fluorescence?

A

A painting with chemicals
(A fluorescent painting)

26
Q

What do X-rays allow us to do?

A

Help us view the internal structure of objects like bones

27
Q

What can gamma rays sterilise?

A

Medical equipment and food

28
Q

Why are gamma rays so useful for sterilisation?

A

They can kill microorganisms without causing any other damage

29
Q

Why dont hospitals just use boiling water to sterilise medical equipment

A

Equipment made of materials like plastic can get damaged

GCSE Physics (12 decks)

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