Q19 (i) (a) Uranium undergoes nuclear fission as shown in the following nuclear reaction.



Calculate the energy released during the fission reaction.

(b) Write any one balanced equation to represent nuclear fusion.

(c) In Rutherford's α-particle scattering experiment, it was observed that most of the α-particles did not deflect; some showed a deflection of more than 90° and some were deflected by even 180°

(1) What hypothesis was made to justify the deflection of α-particle by more than 90°?
(2) State any one postulate of Bohr’s theory

OR

(ii) (a) (1) Define unified atomic mass unit.
(2) Write its energy equivalent.
(3) What is the physical significance of binding energy per nucleon of a nucleus?

(b) The wavelength of the first line of Balmer series (H_α ) is 656·3nm. Calculate the value of the Rydberg’s constant.

Solution

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