Radio waves
Radio waves are the longest lengthwise.
Electric waves produced due to lightning and radio waves (Long waves) are invisible electro magnetic radiations.
It isn't clear what type of wave you are talking about. If you mean electromagnetic waves, the answer is "radio waves".
Radio waves have the longest wavelength in the electromagnetic spectrum (EM), and are pure energy, they have no mass.
Radio Waves. Their wavelength is 103 meters (1 kilometer). Because of this, their waves have the lowest frequency.
Extremely low frequency (ELF) waves have wavelength of the order of 100 megametres ( = 100,000 kilometres).
We have several names for E&M waves, depending on their wavelength. "Radio" is one of the names ... typically the name we use for the longest class of waves.
The shortest radio wave (300 GHz) is something like 1,300 times as long as the longest visible light wave (750 nm).
Radio waves have the longest wavelengths among all types of electromagnetic energy. They have wavelengths ranging from a few millimeters to kilometers.
Electromagnetic (EM) waves are arranged in the spectrum based on their wavelength or frequency. From longest to shortest wavelength/frequency, the EM spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. This arrangement is important because each region of the spectrum has unique properties and interactions with matter.
EM waves stand for Electromagnetic waves.
ultraviolet