Question

How are the energy of infrared, visible light and ultraviolet rays related? And why?

A) Infrared contains the least energy and ultraviolet contains the most energy. The energy of a wave is proportional to its wavelength.
B) Infrared contains the most energy and ultraviolet contains the least energy. The energy of a wave is proportional to its wavelength.
C)
Infrared contains the least energy and ultraviolet contains the most energy. The energy of a wave is inversely proportional to its
wavelength.
D)
Infrared contains the most energy and ultraviolet contains the least energy. The energy of a wave is inversely proportional to its
wavelength.

Answer 1

Infrared contains the least energy and ultraviolet contains the most energy. The energy of a wave is inversely proportional to its

Answer 2

Answer: The correct answer is Option C.

Step-by-step explanation:

Energy of the Electromagnetic Spectrum is given by the Planck's equation:

`E=h\\u`

Where,

E = Energy of the wave

h = Planck's constant

`\\u` = Frequency of the wave

And we know that,

`\\u=(c)/(\lambda)`

where,

c = Speed of light

`\lambda` = Wavelength of the wave

Putting the value of frequency in energy equation, we get:

`E=(hc)/(\lambda)`

From the above relation, we get that energy is inversely related to wavelength of the wave.

From the spectra, we know that order of wavelength follows:

Infrared > Visible > UV

So, the order of energy gets reversed and the order becomes:

Infrared < Visible < UV

From the above information, we conclude that the correct option is Option C.