1. Which of the following electro magnetic waves is not used for communication?
A. Gamma rays ***
B. microwaves
C. Infrared waves
D. Radio waves

2. When you speak into a cell phone, your sound waves must be converted into which other wave form in order to transmit the signal?
A. Gamma rays
B. Ultraviolet rays
C. Microwaves ***
D. Infared

3. The wave above is an electrical signal resulting from a sound wave. How does the information in this electrical signal make it to your car radio?
A. It is carried on an FM wave by modulating its amplitude.
B. It is carried on an FM wave by modulating its frequency.***
C. It is carried on an FM wave by modulating its wave speed.
D. It is carried on an FM wave by modulating its energy.

4. How many Global Positioning System (GPS) satellites are required to pinpoint your location on Earth's surface?
A. 24
B. 12
C. 3 ***
D. 5

***my answer choices
*Not sure how to add image for question 3.

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  1. They all look good to me.

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  2. 1. A
    2. C
    3. B
    4. C

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  3. totally right!!!!^^^^^^^

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