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Science 8 > Light and the Electromagnetic spectrum > Flashcards

Light and the Electromagnetic spectrum Flashcards

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1
Q

What are you always surrounded by?

A

You are always surrounded by invisible waves that even pass through you.

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2
Q

What are some of the invisible waves around you?

A

Microwaves, wireless internet, radio, cellphone waves, suns rays

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3
Q

What is radiant energy?

A

Radiant energy is energy, such as light, that travels by radiation.

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4
Q

Does the sun only radiate visible light?

A

No, the sun radiates a broad spectrum of energy, but we only see a tiny band.

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5
Q

How are light waves different than water waves?

A

In a water wave, water particles vibrate up and down as the wave passes through the water, in a light wave the electrical and magnetic fields vibrate.

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6
Q

What is another name for light?

A

Another name for light is electromagnetic radiation

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7
Q

What is electromagnetic radiation?

A

Electromagnetic radiation is the transmission of energy in the form of waves from the longest radio waves to the shortest gamma waves.

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8
Q

Why can you not see radio and infrared waves in the air?

A

Radio and infrared waves have longer wavelengths and are lower frequency than visible light.

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9
Q

Which waves have the longest wavelength and lowest energy and frequency?

A

Radio waves have the longest wavelength, lowest energy and frequency

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10
Q

What type of waves are microwaves and radar waves?

A

Microwaves and radar are types of radio waves.

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11
Q

What is magnetic resonance imaging?

A

MRI, these are scans of the body that show the insides, such as a brain scan. They can see the energy that is released by the particles in the brain

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12
Q

What are microwaves?

A

Microwaves have the shortest wavelength and the highest frequency of all radio waves.

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13
Q

How does a microwave work

A

Microwaves strongly affect water, so it makes the water in food vibrate quickly and heat up. Only food with water can be heated with microwaves.

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14
Q

How do scientists use microwaves in space?

A

they send microwaves to space to study the composition, motion and structure of distant objects.

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15
Q

What is radar?

A

Radar is used for tracking movement of automobiles, aircraft, spacecraft etc. Weather forcasting. Anything that can reflect the waves can be tracked.

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16
Q

What is RADARSTAT?

A

RADARSTAT is a Canadian satellite that sweeps the ground below with radio waves, monitoring ice flow, oil sills, geographical features etc.

17
Q

What are infrared waves?

A

Infrared waves are a type of electromagnetic radiation that compared to light has a longer wavelength and lower energy.

18
Q

What uses infrared in your home?

A

Your remote control, a CD reader, uses infrared light.

19
Q

What has more infrared energy?

A

A warmer item has more infrared energy.

20
Q

How is infrared used at airports?

A

They use infrared images to monitor heat from people to make sure arrivals do not have fevers and are bringing illnesses to Canada.

21
Q

Which wavelengths carry more energy than light?

A

Wavelengths that are shorter than visible light carry more energy: Ultraviolet, xrays, and gamma rays

22
Q

Where is ultraviolet found?

A

Ultraviolet is just beyond the violet spectrum.

23
Q

What is the difference between ultraviolet light and visible light?

A

Ultraviolet cannot be seen and it has a shorter wavelength and higher energy and frequency.

24
Q

How does your body use ultraviolet light?

A

Your body needs ultraviolet light to create Vitamin D.

25
Q

What happens if you get too much violet light?

A

with too much ultraviolet light you will get a sunburn and skin cancer, or damage to your eye surface.

26
Q

What are some good uses of ultraviolet light?

A

Ultraviolet light shows fingerprints on crime scenes and can kill bacteria in food

27
Q

what did Wilhelm Roentgen discover?

A

Wilhelm Roetgen discovered xray.

28
Q

How is xray different from ultraviolet light?

A

Xray has a shorter wavelength and higher energy and frequency than ultraviolet light.

29
Q

What are some uses of xrays?

A

Xrays are used to examine luggage at airports, your teeth at the dentist, airplane parts

30
Q

What are the highest energy and frequency and shortest wavelength waves in the electromagnetic spectrum?

A

Gamma rays are highest energy and frequency and have the shortest wavelength.

31
Q

How are gamma rays used?

A

Gamma rays are used in cancer treatment in focussed radiation spurts.

32
Q

Where do gamma rays come from

A

Gamma rays come from nuclear reactions and are produced by the hottest regions of the universe.

Science 8 (34 decks)

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