Long-wavelength refers to electromagnetic waves that have longer distances between their peaks. These wavelengths are typically measured in meters and can range from a few millimeters to several kilometers. Examples of long-wavelength radiation include radio waves and microwaves, which are used in various technologies like communication and cooking. In the context of the electromagnetic spectrum, long-wavelength waves have lower frequencies compared to shorter wavelengths, such as visible light or X-rays. This means they carry less energy, making them suitable for applications that require less intensity, such as broadcasting signals over long distances.