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Physics > Waves > Flashcards

Waves Flashcards

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1
Q

What do waves transfer

A

Energy

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2
Q

Transverse waves

A

A wave where the vibrations are right angles to the direction of travel

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3
Q

Longitudinal wave

A

A wave where the vibrations are along the same direction as the direction traveled

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4
Q

Examples of transverse waves

A

Water waves

Electromagnetic radiation

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5
Q

When does defraction occur

A

When waves pass through a gap or around an objects

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6
Q

Electromagnetic radiation speed?

A

Travels at the speed of light 3.0 * 108

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7
Q

Refraction occurs when ?

A

When waves pass from one medium to another

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8
Q

What can waves be mad of

A

Vibrations
Oscillations of particles
Feilds

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9
Q

Examples of longitudinal waves

A

Sound waves

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10
Q

Wavelength

A

Length of one full wave

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11
Q

Amplitude

A

Hight of wave

Represents energy

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12
Q

Speed

A

Distance travelled per unit time

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13
Q

Period

A

Time it takes 1 wave to pass a point

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14
Q

Frequency

A

Number of waves produced per second

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15
Q

Wave speed

A

The distance by a wave per unit time

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16
Q

When is the defraction effect greatest

A

The longer the wavelegth

If the size of the gap same as the wavelegth

17
Q

When are waves slightly defracted

A

If the size of the gap is much larger than the wavelength

18
Q

Why is it easier to receive radio waves on a hill

A

Radia waves are longer which means they diffract more

19
Q

Sources of :

Radio waves

Microwaves

Infra red radiation

Visible light

Ultra violet

X - ray

Gamma ray

A

Radio mast

Magnetron

Hot objects

LED’s

The sun

Collision between high energy objects and a metal target

Radioactive substances

20
Q

Detectors of :

Radio waves

Microwaves

Infra red

Visible light

Ultra violet

X - ray

Gamma ray

A

Aerial

Water

Thermistor CCD’s

Retina

Fluorescent materials

Photographic film

Geiger Muller tube

21
Q

Use of :

Radio waves

Microwaves

Infrared

Visible

Ultra violet

X ray

Gammma ray

A

Radio telescope

Mobile phones

Remote controls

Lasers

Security marking

Medical sans

Radio therapy

22
Q

What does wave speed demand on

A

The medium which it travels through

23
Q

When does light slow down

A

When it enters a more ense medium

Different mediums cause light to Chang direction

24
Q

Where is the normal of an object

A

90 degrees to the object

25
Q

What happens when wavelength increases

A

Frequency decreases

Indirectly porportional

26
Q

What does diffraction not effect

A

Wavelength and frequency

27
Q

What part of the body detect infrared

A

The skin

28
Q

What does sun screen do

A

Blocks the ultraviolet from the sun

29
Q

O-zone layer

A

Stops too much ultra violet getting to the skin

30
Q

X-ray through soft and dense tissues

A

X-ray passes through soft tissues such as skin and muscle

X-ray absorbed by dense tissues such as bones

31
Q

What don’t gamma rays not affect gamma ray sensors

A

Gamma rays only effect living tissues

32
Q

High frequency waves

A

Travel in straight lines and don’t follow the cuviture of earth

33
Q

Uses or refraction of light

A

Telescope

Microscope

34
Q

Why does white light through a prism causes visible light

A

White light is made up of different coloured.

Colours have different frequency

35
Q

Refraction

A

Wave changes speed when it moves from one medium to another

36
Q

Defraction

A

When waves

  • pass a barrier
  • edge
  • through a gap

It bends around it

37
Q

Pensi in water

A

Light from air immersed object has to cross the water

This cause ray of light to change direction

38
Q

When does light ben towards the normal

A

When it goes from less to dense to more dense

39
Q

When does light bend away from the normal

A

More dense ——> less dense

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