Name the phenomenon in which wax melts in the hot sun.

Name the wave phenomenon which is exhibited by light, but not by sound waves.

Name the phenomenon that explains the colours of the films.

Fill in the blanks: The phenomenon in which absorption & adsorption takes place simultaneously is called___________.

Name the principle on which an optical fibre works.

Name the phylum to which sea-walnuts belong. What other common name is also given to them?

Name the noble gas which is radioactive.

Name the element which activates catalase.