Microwaves and its Applications, Slides of Earth science

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MICROWAVES

Group 2

WHAT ARE MICROWAVES?

Microwaves are electromagnetic waves with wavelengths shorter than radio waves. Microwaves fall in the range of the EM spectrum between radio and infrared waves. Microwaves have a range of applications, including satellite communications, radar, television transmission and, perhaps best known by most people, cooking.

FUN FACT:

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Sattelites appear to

be stationary when

seen from Earth

because they

revolve around the

Earth at the same

rate the Earth

rotates around its

axis.

RADAR Radar is a detection system that uses radio waves or microwaves to determine the range, angle, or velocity of objects. Microwaves have short wavelengths and are reflected by small objects. This property is used in radars.

TERRESTRIAL COMMUNICATION Microwaves are used to transmit television news coverage from mobile broadcast vehicles back to the station. The news crew can also set up a small antenna to send signals to a communication satellite.

MICROWAVE OVEN

The microwaves

penetrate the food

being heated. It will

agitate the water

molecules within the

food, thus creating

molecular friction

which then produces

heat that will cook it.

1. Where does microwaves fall in the

EM spectrum?

A. Between radio waves and infrared waves B. Between infrared waves and UV waves C. Between radio waves and gamma rays D. Between X-rays and gamma rays

2. Transmits microwave signals to a

satellite.

A. Receiver B. Radar Device C. Broadcast station D. Antenna

4. A detection system that determines

the range, angle, or velocity of objects.

A. Radar B. Satellite C. Missile D. X-ray

5. The time lag between the

transmitted pulse and reflected pulse

gives the _________.

A. Direction of target B. Distance of the signal C. Distance of the object D. Direction of the object

7. Created when water molecules

within food are agitated.

A. Molecular Heating B. Molecular Fiction C. Molecular Friction D. Cooked food

True of False.

8. Microwaves have longer wavelengths

than radio waves.

9. Satellites revolve around the Earth at

the same rate the Earth rotates around

its axis.

10. Microwaves have higher frequencies

than radio waves.