The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called

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Q: 118 (CDS-I/2010)
The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,78,18,78,6,11,1

keywords: 

{'ultraviolet radiation': [1, 0, 1, 0], 'radiant energy': [0, 0, 0, 1], 'sunburning': [0, 0, 1, 0], 'tanning': [0, 0, 1, 0], 'infrared radiation': [0, 0, 3, 3], 'visible radiation': [0, 0, 3, 2], 'sunlight': [0, 0, 1, 0], 'microwave radiation': [0, 0, 1, 0], 'human skin': [1, 0, 0, 0]}

The correct answer is option 1, ultraviolet radiation. Ultraviolet (UV) radiation is a form of radiant energy that is emitted by the sun. It is responsible for causing tanning and sunburning of human skin. UV radiation is divided into three categories based on wavelength: UVA, UVB, and UVC. UVA has the longest wavelength and is responsible for tanning. UVB has a shorter wavelength and is responsible for sunburning.

Option 2, visible radiation, refers to the range of wavelengths of electromagnetic radiation that can be detected by the human eye. Although visible radiation from the sun does contribute to the warmth felt on the skin, it is not the main cause of tanning and sunburn.

Option 3, infrared radiation, refers to the longer wavelengths of electromagnetic radiation that are felt as heat. While infrared radiation from the sun can warm the skin, it is not the primary cause of tanning and sunburn.

Option 4, microwave radiation, refers to electromagnetic waves with longer wavelengths than infrared radiation. It is not associated with causing tanning or sunburning of human skin.

Therefore, the correct answer is option 1, ultraviolet radiation.