What is radioactivity ?

Name the noble gas that is radioactive?

Which of the following has highest value of radioactivity ?

What is artificial radioactivity ?

The half life period of a radioactive substance is 15 minutes. What per cent of radioactivity of that material will remain after 45 minutes ?

The device used for the measurement of radioactivity is :

Which of the following is an example of induced radioactivity ?

In an experiment, the carbon dioxide available to a C_(3) plant was labelled with a radioactive isotope and the amount of radioactivity in the chloroplast was measured.As photosynthesis proceeded, in which of the following molecules did the radioactivity first appear ?

Radioactivity is due to

a) What are radioactive wastes? Mention how radioactive wastes are disposed. b) Write short notes on e-wastes.