Which of the following have the longest wavelengths?
Answer Details
Radio waves have the longest wavelengths among the given options. This is because radio waves have the lowest frequency and the longest wavelength in the electromagnetic spectrum, ranging from about 1 millimeter to over 100 kilometers. They are commonly used for communication purposes, such as radio and television broadcasts, cell phone signals, and Wi-Fi. Infra-red, ultra-violet, X-rays, and gamma rays have shorter wavelengths and higher frequencies than radio waves, and are used in various applications such as medical imaging, sterilization, and remote sensing.