Nuclear Fission : . Increasing crops : Radio phosphorous, Effective functioning of heart : . Deflected by electric field : α ray, Null Deflection : VII. Numerical problems: .
Ra experiences three α - decay. Find the number of neutrons in the daughter element. . A cobalt specimen emits induced radiation of .
millicurie per second. Convert this disintegration in to becquerel (one curie = . × Bq) VIII. Assertion and reason type questions: Mark the correct choice as (a) If both the assertion and the reason are true and the reason is the correct explanation of the assertion.
(b) If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion. (c) Assertion is true, but the reason is false. (d) Assertion is false, but the reason is true. .
Assertion: A neutron impinging on U , splits it to produce Barium and Krypton. Reason : U - is a fissile material. . Assertion : In a β - decay, the neutron number decreases by one.
Reason : In β - decay atomic number increases by one. . Assertion : Extreme temperature is necessary to execute nuclear fusion. Reason : In a nuclear fusion, the nuclei of the reactants combine releasing high energy.
Nuclear physics . Assertion : Control rods are known as 'neu- tron seeking rods' Reason : Control rods are used to perform sustained nuclear fission reaction IX. Answer in one or two word (VSA) . Who discovered natural radioactivity?
. Which radioactive material is present in the ore of pitchblende? . Write any two elements which are used for inducing radioactivity?
. Write the name of the electromagnetic radiation which is emitted during a natural radioactivity. . If A is a radioactive element which emits an α - particle and produces Rf .
Write the atomic number and mass number of the element A. . What is the average energy released from a single fission process? .
Which hazardous radiation is