"Photosynthesis protects us from harmful ultraviolet radiation of sun". Comment on the statement.

Welders wear special goggles or face masks with glass windows to protect eyes from electromagnetic radiations. Name the radiations and write the range of their frequencies.

Melanin pigment protects from which of the following radiations?

Which kind of surface will absorb maximum radiation from sun ?

Study the following statements about ozone: a) It is essential for breathing of living organisms. b ) It is used to disinfect water. c ) It absorbs ultraviolet rays. d ) Its proportion in air is about 3 % Which of these statements are correct?