Answer:
Shortest wavelength.
gamma rays.
X-rays.
ultraviolet.
visible light.
infrared.
radio waves.
Longest wavelength.
Explanation:
The frequencies of this wave is one of their easiest characteristic to measure.
The order of the wavelength is basically opposite of the order of their frequency.
For example, of them all, radio waves has the lowest frequency, hence, it has the longest wavelength. Also, gamma rays have the highest frequency of the electromagnetic spectrum of light, hence, gamma rays have the shortest wavelength.
