Which of the following radiations has the longest wavelength?
Answer Details
Electromagnetic radiation is characterized by its wavelength and frequency. The wavelength is the distance between consecutive peaks of the wave, and the frequency is the number of waves that pass a given point in a certain amount of time.
In general, the longer the wavelength, the lower the frequency and energy of the radiation.
(Gamma rays) Gamma rays have the shortest wavelength and highest frequency and energy of the four types of radiation listed.
(Radio waves) Radio waves have the longest wavelength and lowest frequency and energy of the four types of radiation listed.
(Infrared rays) Infrared rays have a longer wavelength than X-rays and gamma rays, but shorter than radio waves.
(X-rays) X-rays have a shorter wavelength than infrared rays and radio waves, but longer than gamma rays.
So, the answer is radio waves have the longest wavelength.