Infrared, visible and ultraviolet radiations/ light have different properties. Which one of the following statements related to these radiations/light is not correct?
The wavelength of infrared is more than that of ultraviolet radiation.
The wavelength of ultraviolet is smaller than that of visible light.
The photon energy of visible light is more than that of infrared light.
The photon energy of ultraviolet is lesser than that of visible light.
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CDS-2 – 2017
Electromagnetic radiations are ordered by their frequency or wavelength. In order of increasing energy (and frequency, and decreasing wavelength), the spectrum goes from Infrared (IR) to Visible light to Ultraviolet (UV). Photon energy is directly proportional to frequency (E = hf) and inversely proportional to wavelength (E = hc/λ). Therefore, UV radiation has higher frequency, higher photon energy, and shorter wavelength compared to visible light and infrared radiation.