🔍 Key Concepts

• Carrier wave and how its properties (amplitude, frequency, phase) can be altered • Difference between amplitude modulation (AM) and frequency modulation (FM) • Role of sidebands in an AM signal

💭 Think About

• Which property of the carrier is changed in AM: its strength (height), its pitch (how fast it oscillates), or its content? • In AM, does the carrier wave disappear and get replaced by tones, or does it stay present while carrying information? • What happens to the carrier’s frequency during amplitude modulation—does it shift around, or stay fixed while something else varies?

✅ Before You Answer

• Identify which choices describe changing amplitude vs. changing frequency. • Check which option incorrectly describes frequency modulation (FM) instead of AM. • Look for the option that keeps the carrier frequency constant while varying something else to match the information signal.