ENHANCING COMMUNICATION WITH WAVES
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.
1. A
2. C
3. B
4. C
totally right!!!!^^^^^^^
They all look good to me.
To determine the correct answers to these questions, we need to understand the properties and uses of different electromagnetic waves.
1. The electromagnetic wave that is not used for communication is A. Gamma rays. Gamma rays have very high frequencies and are used in various fields such as medical imaging and radiation therapy, but not for communication purposes.
2. When you speak into a cell phone, your sound waves are converted into C. Microwaves in order to transmit the signal. Microwaves are utilized in wireless communication systems such as cell phones due to their ability to penetrate the atmosphere and carry information over long distances.
3. The information in the electrical signal from a sound wave is carried to your car radio by B. Modulating its frequency on an FM (Frequency Modulation) wave. FM waves are used in radio broadcasting to vary the frequency of the carrier wave based on the audio signals, allowing for the transmission of sound.
4. To pinpoint your location on Earth's surface using the Global Positioning System (GPS), a minimum of C. 3 satellites is required. The GPS system utilizes a network of satellites orbiting the Earth to accurately determine the coordinates of a GPS receiver. Triangulation is used to calculate the receiver's position based on signals received from multiple satellites.