PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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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.