Question

Radio waves : Longer than about 20 cm :: Infrared waves ___________​

Answer 1

Radio waves : Longer than about 20 cm :: Infrared Rays : LONGER THAN 780 nm

Let's learn a few facts about electromagnetic waves:

• Electromagnetic waves propagate at a velocity of 3 × 10⁸ m/s.

• They contain 2 components : electrical component and a magnetic component.

• If we see the electromagnetic spectrum, we will observe that Gamma rays have a least wavelength (highest frequency) and Radio waves have highest wavelength (lowest frequency).

• In the electromagnetic spectrum, there is a group of waves, which fall under visible spectrum (containing all the visible light rays like red, violet, blue, etc.)

• The wavelength of the electromagnetic spectrum begin from 10^(-16) m and range upto 10⁸ metres.

• The visible spectrum ranges from 400 nm upto 720 nm.

$\star$ Hope It Helps.