Question

Which of the following correctly lists electromagnetic waves in order from longest to shortest wavelength?
A) microwaves, ultraviolet, visible light, gamma rays
B) radio waves, infrared, Ultraviolet ,gamma rays
C) gamma rays, ultraviolet, infrared, microwaves

Answer 1

• Option A is your correct answer.

The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.

Answer 2

Among the following, correctly listed electromagnetic waves in order from longest to shortest wavelength is: radio waves, infrared, ultraviolet, gamma rays.

• Radio waves have the longest wavelength ranging from 10⁻¹ to 10⁴ m.
• They are produced by oscillating electric circuits.
• They are used in radio and television communication systems.
• Infrared radiations have a wavelength ranging from 8×10⁻⁷ to 5×10⁻³ m.
• They are produced from hot bodies and from rotational and vibrational transitions in molecules.
• They are used to provide electrical energy to satellites, for treating muscular strains and in solar water heaters and cookers.
• Ultraviolet radiations have a wavelength ranging from 6×10⁻¹⁰ to 4×10⁻⁷ m.
• They are produced by sun, arc, vacuum spark and ionized gases.
• They are used in the detection of invisible writing, forged documents, fingerprints and to preserve food stuff.

• Gamma rays have a wavelength ranging from 10⁻¹⁴ to 10⁻¹⁰ m.
• They are produced by transitions of atomic nuclei and decay of certain elementary particles.
• They are used to provide information about structure of atomic nuclei.