Question

HELP PLEASE!

Which part of the electromagnetic spectrum has the lowest radiant energy?

(a) ultraviolet

(b) infrared

(c) x-rays

(d) visible light

Answer 1

Hey!
The answer will be B.
Because infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.
Cheers,Irys

Answer 2

Answer: b) infrared

Step-by-step explanation:

Radiant energy of an electromagnetic radiation is determined by its frequency and wavelength. Higher frequency and lower wavelength has highest radiant energy. On the other hand, lower frequency and higher wavelength produces less radiant energy.

Order of frequency from highest to lowest:

x-rays(10¹⁶ Hz to 10¹⁹ Hz) > Ultraviolet (10¹⁴ Hz) > visible (between 430 THz and 770 THz) > infra-red ( less than 430 THz)

Thus, infra-red which has least frequency would have lowest radiant energy.