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Science > Waves - PHYSICS > Flashcards

Waves - PHYSICS Flashcards

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1
Q

What differs transverse waves from longitudinal?

A

Transverse waves - are waves where the oscillation is perpendicular to the direction of travel.
Whereas with longitudinal the oscillation is parallel

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2
Q

Differences between longitudinal and transverse waves include…

A

-The direction of particle oscillation
-Transverse waves have peaks and troughs whereas longitudinal waves have compressions and rare fractions
-Longitudinal waves always need a medium (matter) to travel through

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3
Q

What are the similarities between longitudinal and transverse waves?

A

-Both transfer energy
-Both can be reflected
-Both have repeated cycles

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4
Q

What is the frequency of a wave?

A

The number of waves passing a point in one second. Measured in hertz.

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5
Q

What is the period of a wave?

A

How long it will take for one wave to pass a point . Inverse of frequency

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6
Q

Speed = ………. X ……….

A

Speed = frequency X wavelength

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7
Q

Equation for the period of a wave=

A

T=1/f

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8
Q

Average speed of sound = …………/time

A

Distance

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9
Q

Equation of frequency = number of waves / ………..

A

time taken

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10
Q

Velocity = ……….. X ……….

A

Velocity = frequency X wavelength

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11
Q

What are the seven types of waves?

A

-Ultraviolet
-Radio
-Visible
-X-ray
-Infarared
-Gamma
-Microwaves

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12
Q

What type of wave has the lowest frequency?

A

Radio waves

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13
Q

What are the dangers of radio waves?

A

-Cancer
-Leukaemia

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14
Q

What are the uses of microwaves?

A

-A cooking microwave
-Phones
-WIFI

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15
Q

What are the dangers of microwaves?

A

Cataracts

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16
Q

How is infrared produced?

A

It is given off by hot objects

17
Q

What are the uses for Infrared?

A

-Remote controls
-Healing injuries (sports)
-Night cameras

18
Q

What is visible light given off by?

A

Anything that is hot enough to glow

19
Q

What are the uses of visible light?

A

-DVD players
-Laser printers

20
Q

What are the dangers of visible light?

A

Damage the retina in your eye

21
Q

What are the uses for Ultraviolet?

A

Sun tan
Detecting forged bank notes
Kill microbes
Sterilisation

22
Q

What produces ultra violet light?

A

The sun
Special lamps

23
Q

What are the damages of X-rays

A

Cell damage
Cancer

24
Q

What is the highest frequency waves?

A

Gamma.

25
Q

What is rarefraction?

A

When waves cross a boundary between different mediums causing a change in speed and direction and therefore wavelength

26
Q

What are the four different surfaces on a Leslie cube?

A

A shiny metallic surface
A white surface
A shiny black surface
A Matt black surface

27
Q

What gives off infrared radiation?

A

All bodies (objects), no matter the temperature emit and absorb infrared radiation.

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