Question:
Among the following, which is not true for ultraviolet light?
Among the following, which is not true for ultraviolet light?
Show Hint
Different electromagnetic radiations are identified more by their uses and interactions than by vague beam-shape descriptions.
Updated On: Apr 29, 2026
- induces the production of more melanin, causing tanning of the skin
- can be focused into very narrow beams
- kills germs in water purifiers
- used in eye surgery
- treatment for certain forms of cancer
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Ultraviolet light is used for sterilization, tanning, and some medical treatments. The statement “can be focused into very narrow beams” is more characteristically associated with lasers rather than being a special property of ultraviolet light.
Hence,
\[
\boxed{(B)}
\]
Was this answer helpful?
0
0
Top KEAM Physics Questions
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- Two capillary tubes A and B of diameter $1\, mm$ and $2\, mm$ respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is
- In the circuit given in figure, 1 and 2 are ammeters. Just after key K is pressed to complete the circuit, the reading will be
- A plate has a length $ 5\pm 0.1\text{ }cm $ and breadth $ 2\pm 0.01\text{ }cm $ . Then the area of the plate is:
View More Questions
Top KEAM Electromagnetic Spectrum Questions
- The correct order of arrangement of electromagnetic waves according to their wavelengths is
- Electromagnetic waves of frequency \( 5 \times 10^{14} \, {Hz} \) lie in the
- If work function of a metal is 6.6 eV, find the threshold wavelength. \text{Given} \( h = 6.6 \times 10^{-34} \, \text{J} \cdot \text{s} \).
- If \( v_g, v_X \) and \( v_v \) are the speeds of gamma rays, X-rays and visible light respectively in vacuum, then
- The electromagnetic waves used in radar systems for aircraft navigation are
View More Questions
Top KEAM Questions
- i.$\quad$ They help in respiration ii.$\quad$ They help in cell wall formation iii.$\quad$ They help in DNA replication iv. $\quad$They increase surface area of plasma membrane Which of the following prokaryotic structures has all the above roles?
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
- The pH of a solution obtained by mixing 60 mL of 0.1 M BaOH solution at 40m of 0.15m HCI solution is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- If $\int e^{2x}f' \left(x\right)dx =g \left(x\right)$, then $ \int\left(e^{2x}f\left(x\right) + e^{2x} f' \left(x\right)\right)dx =$
View More Questions