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Physics > Electromagnetic Spectrum > Flashcards

Electromagnetic Spectrum Flashcards

0
Q

What type of waves are electromagnetic waves?

A

They are transverse waves

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1
Q

Can electromagnetic waves travel through a vacuum?

A

Yes all electromagnetic waves can travel through a vacuum

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2
Q

What speed do all electromagnetic waves travel in a vacuum?

A

3.0 x 10^8

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3
Q

When are electromagnetic waves produced?

A

When atoms or electrons loose energy

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4
Q

What are the uses of radio waves?

A 
Carrying signals, such as signals for radio and TV
Navigation
Studying the universe
Satellite communication
Control signals: garages, key fobs
Tracking and automatic identification
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5
Q

What are some of the roles of microwaves?

A

Cooking, heating foods in microwaves or ovens

Communications such as mobile phones

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6
Q

What are some of the roles of infra-red?

A 
Thermal imaging
Night vision cameras
Short range communications
Optical fibres
Security systems
Cooking and heating
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7
Q

What are some of the uses of x-Rays?

A 
Medical x-rays 
Observing the internal
Structure of objects
Killing cancer cells
Airport security scanners
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8
Q

What are some of the safety issues of x-rays?

A

X-Rays can harm healthy tissue

X-Rays can kill some cells prematurely

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9
Q

What are some safety hazards of microwaves?

A

Cancer

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10
Q

What is the triangle of density?

A

Mass

Density Volume

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11
Q

How would you conduct an experiment to measure the density of an irregular solid shape?

A

You could place it in water and then measure the difference between the volume of the water. This is the volume. Then measure the mass. Then do the calculation to measure the density.

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12
Q

How would you conduct an experiment to tell the density of a liquid?

A

You would measure the volume of the liquid and then measure the mass of it. You then do the calculation to find out the density mass/volume.

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13
Q

How would you conduct an experiment to measure the density of a regular shaped solid?

A

Work out the volume and the do the calculation to work out the density.

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14
Q

How would you measure the volume of a sold that doesn’t fit the measuring cylinder?

A

You could use a eureka can and then measure the overflow of water.

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15
Q

How would you know if an object will float in water?

A

You would measure its density and then see if it’s density is higher than water. If it is then it’s will float.

16
Q

What is an experiment to measure if an object is a good/bad conductor?

A

Attach drawing pins to the metal with wax. Then heat one side of the metal. Measure to compared to other metals. Wait for the wax to not and see how long it takes for all the drawing pins to fall of.

Use conductivity bars and heat the bottom of the. You van either measure, colour or time. Either time how long it takes for a colour to move up the bar, or the colour it is after a certain time.

17
Q

How do materials conduct?

A

When a material is heated, the particles move faster causing there neighbouring particles to move fatser.

In metals the electrons are loose instead of firmly attached. When a metal is heated the electrons move randomly around the metal

18
Q

What is convection in liquids and gases?

A

Warm air/liquids rise above cold ones. Causing the liquid and air to move in a circle.

19
Q

What type of transfer is convection?

A

Thermal transfer

20
Q

Is infra-red radiation on the magnetic spectrum?

A

Yes

21
Q

Does infra-red require a medium

A

No

22
Q

Which colour surface emits and absorbs heat the fastest?

A

Black

23
Q

Which sort of surface absorbs and emits hear the fastest?

A

Matte not shiny

24
Q

Which colour of surface reflects heat the best?

A

White and shiny

25
Q

How do you test the best surfaces for absorbing and emitting heat?

A

Put water in a black and silver can and test which one cools the fastest.

26
Q

What does the amount of radiation depend on?

A

Surface temperature and area

27
Q

What household objects use conduction?

A

Saucepans

Kettles

28
Q

What everyday items use convection?

A

Radiators
Underfloor heating
Ovens
Kettle

29
Q

What everyday objects use radiation?

A

Tin foil

Physics (1 decks)

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