Short Answer Type(i) Write a balanced equation showing nuclear fission of Uranium 
(ii) In a nuclear reactor, what is the function of:
(1) Cadmium rods? (2) Graphite rods?
On an energy level diagram of hydrogen, show by a downward or an upward arrow, a transition which results in:
(i) Emission line of Balmer series.
(ii) Emission line of Lyman series.
(iii) Absorption line of Lyman series.
and Its binding energy in MeV.
Mass of a proton = 1.007276 u
Mass of a neutron = 1.008665 u
Mass of 
nucleus = 4.001506 u
Maximum K.E of emitted electrons is given (K.E)max 
where,
λ is wavelength of ultraviolet light λ0 is the threshold wavelength of certain metal c is the speed of light and h is Planck’s Constant.
λ0 = 792 nm, c = 3 x 108 m/sec
λ= 396 nm, h = 6.6x 10-34 Js.
On putting these value in the formula,
K.E = 6.6 x 10-34 x 3 x 108 x 109 
= 6.6 x 10-34 x 3 x 1017 
= 6.6 x 10-17 x 3 
= 0.025 x 10-17
= 2.5 x 10-19 J
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