That's Entertainment - Waves Section Flashcards

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1
Q

Do particles or energy move along a wave?

A

Wave energy does, particles do not.

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2
Q

What is a crest of the wave?

A

Top of wave

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3
Q

What is the trough?

A

Bottom of wave

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4
Q

What is an amplitude?

A

The heigh of the crest or trough from it’s rest position

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5
Q

What is a wavelenghth?

A

The length of one wave from crest to crest.

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6
Q

What is frequency?

A

The number of waves passing a point in one second. Measure in hertz (Hz)

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7
Q

What is speed?

A

The distance a wave travels in a certain time (m/s)

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8
Q

What do light waves travel as?

A

Transverse waves

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9
Q

What do sound waves travel as?

A

Longitudinal waves.

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10
Q

What is absorption?

A

Absorption happens with light waves.
• When white light falls on a black object it is absorbed eg. Seeing a coloured object
• Opaque objects do not allow light to penetrate
• Transparent objects allow light to penetrate
• Translucent objects allow some light to penetrate

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11
Q

How do we see colours?

A

Visible light is made up of seven colours, these rays hit an object. All the colours are absorbed except the colour of the object which is reflected into your eyes.

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12
Q

What is reflection?

A

Light waves bouncing off objects
• Angle of incidence = angle of reflection
• Eg. Reflection off a mirror

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13
Q

What is refraction?

A

Bending of light through different matter
• Bend more in a solid as the particles are closer
Together, compared to travelling through a gas where the particles are further apart this causes the light to change its speed
• Eg. Refraction while fishing in water

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14
Q

What happens to energy in a sound wave?

A

When particles begins to vibrate they start to ‘bump’ into each other

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15
Q

What happens to sound waves in solids?

A

The particles vibrate faster as the particles are closer together or more dense so the transfer of energy is much quicker. The sound will travel faster through a solid object.

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16
Q

What happens to sound waves in gas?

A

The particles are less dense or further apart the energy transferred from on particle to another is much slower therefore sound travels through a gas much slower. This is opposite to travelling through solids.

17
Q

Where do sound waves travel slower? Gases, liquids, or solids?

A

Gases

18
Q

What is the electromagnetic spectrum

A

The electromagnetic spectrum includes Electromagnetic radiation (EMR), a form of energy that moves as waves as it travels through space.

19
Q

What are gamma rays used for?

A

Treat cancer, radioactive source

20
Q

What are x-rays used for

A

X-ray photographs to examine bones, metal objects for cracks, luggage at airports

21
Q

What are ultra violet rays used in?

A

Fluorescent tubes

22
Q

What is visible light used in?

A

Seeing and lasers.

23
Q

What is infrared rays used for?

A

Remote controls in TV’s, cameras, satellites, telescopes.

OPTICAL FIBRE AND COMMUNICATIOn

24
Q

What are microwaves used for?

A

Cooking in microwave ovens, radar

25
Q

What are radio waves used for?

A

AM, FM radio, television signal

26
Q

Are waves with the highest frequency have the shortest or longest wavelength?

A

The shortest. Waves with low frequencies such as radio waves have long wavelengths in order to produce signals to long distances.