1. State one limitation of solar energy available from solar cells

  1. State one limitation of solar energy available from solar cells.
  2. What is the minimum wind velocity required to obtain useful energy with a windmill?
  3. Define the term ‘nuclear fission’.
  1. The solar cells are costly and hence, the energy available from them is expensive.
  2. 15 km/h is the minimum wind velocity required to obtain useful energy with a windmill.
  3. Nuclear fission is the process in which a radioactive atom splits up into smaller nuclei when struck with low energy neutrons.