Microwaves

By: Marie Schmid, Jenny Reybrock, Kyle Williams

Table of Contents

• What is a microwave?

• Characteristics

• What can it go through?

• Discovery

• Past, present, and future uses

• Dangers (microwave sickness)

What is a microwave?

• Short, high frequency wave of electromagnetic energy.

• Short radio wave

Characteristics

• Wave Length– between one and three hundred millimeters.

(.25” – 12”)

• Frequency – Between 300 MHz and 300 GHz

• Invisible

What can it go through?

• Glass• Paper• Plastic• Most ceramics• Rain• Smoke • Fog • Ionosphere

Discovery

• Who found it?– Harry Boot– John Randall

• Found it how?

- On accident

- Looking for submarines

• How was it found to help cook food?

- Dr. Spencer

Past Uses

• Used in World War Two

• Radio Contacting

• Finding Submarines

Present Uses

• Microwave oven (to heat food)• Satellites• Space communications• Navigations• Car phones• Radar• Drying materials• Medicine for diathermy treatment

Future Uses

• Satellite dishes

• Cell-phone towers

• What we use today

Microwave Sickness

• First Signs– Low blood pressure– Slow pulse

• Later Signs

-sympathetic nervous system (stress)

-High blood pressure

• Increased risk of caner

Microwave Sickness

• Symptoms– Headache– Dizziness– Eye pain– Sleeplessness– Stomach pain– Nervous tension– Hair Loss

MORE DANGER!

• Microwaves leaking from an oven can be hazardous to people.

• Harmful to pregnant women, because of the radiation leakage.

Sources

Smgaels.org

Google Images

World Book Encyclopedia

The Glencoe Book