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Physics iGCSE > Physics- Waves > Flashcards

Physics- Waves Flashcards

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0
Q

Speed (wavelength)

A

V = f x wavelength

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1
Q

Frequency

A

F = 1/T

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2
Q

Refractive index

A

n = sin i/sin r

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3
Q

Critical angle

A

Sin C = 1/n

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4
Q

Light and electromagnetic waves are ???

A

TRANSVERSE WAVES

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5
Q

Examples of TRANSVERSE WAVES

A

Light
EM waves
Slinky spring wiggled up and down
Ripples on water

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6
Q

Sound waves are ???

A

LONGITUDINAL WAVES

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7
Q

Examples of LONGITUDINAL WAVES

A

Sound
Shock waves
Slinky spring pushed on one end

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8
Q

In transverse waves the vibrations are……

A

90 degrees to the direction of energy

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9
Q

Longitudinal waves the vibrations are…..

A

Along the same direction as energy is transferred

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10
Q

EM Waves longest wavelength to shortest wavelength

Which has highest / lowest frequency???

A

Radio waves, microwaves, infra red, visible light, ultra violet, x Rays, gamma rays

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11
Q

VISIBLE LIGHT shortest wavelength colour??
Longest wavelength colour??

Frequency?

A

RED has longest wavelength, lowest frequency

VIOLET has shortest wavelength, highest frequency

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12
Q

Uses of RADIOWAVES

A

Communications

Radio broadcasting

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13
Q

Uses of MICROWAVES

A

Satellite communication

Cooking - microwaves absorbed by water molecules in food

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14
Q

Uses of INFRARED

A

Heating

Monitor temperature

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15
Q

Uses of VISIBLE LIGHT

A

Can travel through optical fibres - used for telephone and broadband internet cables

Photography

16
Q

Uses of ULTRAVIOLET

A

Fluorescent lamps

17
Q

Uses of X-RAYS

A

See inside things - internal structure of objects

18
Q

Uses of GAMMA RAYS

A

Sterilising medical equipment

Sterilising food

19
Q

Danger of MICROWAVES and protection?

A

Can heat human body tissue

Needs shielding to prevent from reaching user

20
Q

Danger of INFRARED and protection?

A

Too much infrared exposed to skin- skin burning

Wear insulating materials to reduce amt reaching skin

21
Q

Danger of ULTRAVIOLET and protection?

A

Damage surface cells
Blindness
Cell mutation or destruction and cancer

Wear sunscreen
Stay out of strong sunlight

22
Q

Danger of GAMMA and protection?

A

(Highest frequency so most harmful - carry most energy)

Cause cell mutation and destruction -> tissue damage or cancer

Exposed for short time only, sources kept in lead-lined boxes

23
Q

Law of reflection ?

A

Angle of incidence = angle of reflection

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