P5.2 Flashcards

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1
Q

What waves are on the magnetic spectrum (in order of increasing frequency).

A
Radio waves, 
microwaves, 
infrared, 
visible light, 
ultraviolet, 
X-rays
Gamma rays
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2
Q

What are electromagnetic waves?

A

Electromagnetic waves consist of oscillating electric and magnetic fields. The fields are oscillating in a direction at 90° to the direction of the wave.
All electromagnetic waves travel through a vacuum at 3 X 10^8 m/s (the speed of light)

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3
Q

What do electromagnetic waves do?

A

They transfer energy from sources to absorbers. Some waves transfer info.

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4
Q

How do you calculate frequency of a wave

A

Frequency = wave speed / wave length

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5
Q

How are electromagnetic waves used for communication?

A

Your phone communicated with trans,otters using microwaves. Microwaves are also used to communicate with satelites and for WiFi and bluetooth systems.

Remote controls use infrared to communicate with televisions.

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6
Q

How are microwaves used to heat up food?

A

In. Microwave oven, the water and fat in food absorb the microwaves which heats up the outside of food. Conduction transfers energy to the middle.

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7
Q

How are gamma rays useful in medicine?

A

Gamma rays can kill cancer cells and also bacteria on food

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8
Q

How are ultraviolet rays useful in medicine

A

It kills bacteria in water

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9
Q

How are X rays useful in medicine

A

X-rays can kill skin cancer or other cancer cells

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10
Q

Which waves are dangerous and why?

A

Ultraviolet radiation can damage the DNA in the cells of your skin.
These cells can grow rapidly and cause skin cancer
X-RAYS can also da,age your cells and cause cancer
GAMMA RAYS can also damage or kill the cells in your body.

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