Q1: Out of the following, __________ waves have the largest wavelength.

ANS:A - radio

Out of the following options, radio waves have the largest wavelength. Explanation:

1. Radio Waves: Radio waves have the longest wavelengths among the electromagnetic spectrum. They can have wavelengths ranging from several centimeters to thousands of kilometers. Due to their long wavelengths, radio waves are used for long-distance communication, such as radio broadcasting, telecommunications, and radar.
2. Light Waves: Light waves, including visible light, have wavelengths that are shorter than radio waves but longer than X-rays and gamma rays. Visible light has wavelengths ranging from approximately 400 to 700 nanometers. Visible light is responsible for the sensation of sight and is utilized in various applications, including illumination and optical communication.
3. X-rays: X-rays have shorter wavelengths compared to both radio waves and visible light. X-rays have wavelengths ranging from about 0.01 to 10 nanometers. They are commonly used in medical imaging, security screening, and industrial applications due to their ability to penetrate materials.
4. Gamma Rays: Gamma rays have the shortest wavelengths and highest frequencies among the electromagnetic spectrum. They have wavelengths less than 0.01 nanometers, often on the order of picometers. Gamma rays are emitted during radioactive decay and nuclear reactions. They are used in medical treatments, sterilization processes, and scientific research.