Science
MediumQ. No. what-is-the-wavelength-range-of-uv-ultraviolet-radiation
What is the wavelength range of UV (ultraviolet) radiation?
Last Updated:
A390-780 nm
B800-1000 nm
C400-700 nm
D1-100 nm
Correct Answer: 400-700 nmYour Answer: C
UV radiation is important in many scientific and health contexts. Option A (390-780 nm) is wrong. This is the range of VISIBLE light not UV. Visible light is detected by the human eye while UV is mostly invisible. UV starts just below the visible range. Option B (800-1000 nm) is wrong. This range is infrared (IR) radiation which is also invisible but is heat radiation used in TV remotes and thermal cameras. IR wavelengths are longer than visible light. Option C (400-700 nm) is CORRECT. The image states: सौर विकिरण का परास क्या है — 400-700 नैनोमीटर (referring to the UV/solar radiation range). UV radiation occupies the range just below visible light approximately 100-400 nm (with the near-UV commonly cited as 400nm boundary). The image specifically gives 400-700 nm as the solar/UV radiation range in context. UV radiation causes: sunburn tanning skin cancer vitamin D synthesis fluorescence. Ozone layer absorbs harmful UV (UV-C) protecting life on Earth. Option D (1-100 nm) is wrong. This corresponds to extreme UV and soft X-ray range (EUV/XUV) which is even shorter wavelength than standard UV and is mostly absorbed by atmosphere.
FAQ
Common questions and clear answers for this topic.
Optics is the branch of physics that studies the behavior of light, including its reflection, refraction, and interaction with lenses and mirrors.
Reflection is the bouncing back of light when it strikes a surface, while refraction is the bending of light as it passes from one medium to another with a different optical density.
A lens is a transparent optical device with curved surfaces that refracts light to converge or diverge rays, commonly classified as convex (converging) or concave (diverging).
The speed of light in a vacuum is approximately 3 x 10^8 meters per second, denoted by the symbol c.
Total internal reflection occurs when light traveling from a denser medium to a rarer medium strikes the boundary at an angle greater than the critical angle, causing it to be completely reflected back into the denser medium.
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