History of radio

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/history-of-radio

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the theoretical foundation?Based on Maxwell's theories of electromagnetic waves and Hertz's experimental confirmations
2. What is the pioneering application?Early development focused on 'wireless telegraphy' for coded message transmission
3. What are radio waves and how do they carry sound?Radio waves are invisible waves that travel through the air at the speed of light. They carry sound by turning voices into electrical signals that can travel without wires.
4. How did people first use radio before music?The first use was wireless telegraphy, which sent Morse code over long distances without wires. It helped ships and armies talk to each other across oceans and borders.

Electromagnetic Spectrum: The range of all types of electromagnetic radiation, including radio waves, visible light, and X-rays.
Amplitude Modulation (AM): A method of transmitting signals by varying the amplitude of a carrier wave according to the information signal.
Frequency Modulation (FM): A method of transmitting signals by varying the frequency of a carrier wave according to the information signal.
Spark-Gap Transmitter: An early type of radio transmitter that produced radio waves by creating an electric spark.