Amplitude modulation

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/amplitude-modulation

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 historical origin?Developed in the early 20th century, with significant contributions around 1900
2. What is the spectral characteristics?Standard AM (DSBAM) produces a carrier and two sidebands (upper and lower)
3. How does AM let radio stations talk to people?AM radio stations change the wave’s strength to match the voice or music. The receiver reads those changes and turns them back into sound. That’s how we hear radio shows.
4. Why do some radios use AM instead of FM?AM is very simple to make and can travel very far, especially at night when the sky helps bounce the waves. That makes AM great for long‑distance radio, like shortwave and aviation radios.

Amplitude Modulation (AM): A modulation technique that varies the amplitude of a carrier wave according to the message signal.
Carrier Wave: A high-frequency sinusoidal wave used as a vehicle for transmitting information.
Sidebands: Frequency components created during modulation, located above and below the carrier frequency.
Quadrature Amplitude Modulation (QAM): A modulation scheme that combines amplitude and phase modulation to increase data transmission rates.