🔍 Key Concepts

• Crystal oscillators are used to create very stable electronic frequencies • Think about which crystalline material is famous for use in watch and radio frequency control circuits • Consider which option is commonly associated with electronic timing circuits and resonators

💭 Think About

• Which of these materials have you heard of being used in electronic watches, clocks, or radio transmitters as the timing element? • Some of these are semiconductors or minerals used in early radio detectors—can you recall which one is especially linked with precise frequency control? • Among the options, which material is mass-produced specifically for its stable vibrational properties when cut into thin crystals?

✅ Before You Answer

• Identify which choice is most commonly linked to frequency control and timing in electronics • Eliminate any materials that are primarily known as semiconductor substrates rather than as resonating crystals • Focus on the material you most often see mentioned with electronic oscillators and digital watches