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1. What is stellar energy?
The main source of stellar energy is , which is abundant in stars. The of stars are extremely high, causing the .
Fusion reaction that takes place in the cores of the Sun and other stars results in an enormous amount of called stellar energy.
2. Give any two uses of radio isotopes in the field of agriculture.
(i) Radio isotope of helps in .
(ii) Certain perishable cereals exposed to radiations retain their freshness for longer than their , extending their .
3. State Soddy and Fajan’s displacement law.
(i) When a radioactive element emits an particle, a daughter nucleus is formed whose mass number is units, and the atomic number is units than the mass number and the atomic number of the parent nucleus.
(ii) When a radioactive element emits a particle, a daughter nucleus is formed whose mass number is the , and the atomic number is unit than the atomic number of the parent nucleus.
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