Physics

ICSE Class 12

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(i) Write a balanced equation showing nuclear fission of Uranium

nucleus.(ii) In a nuclear reactor, what is the function of:

(1) Cadmium rods? (2) Graphite rods?

(i) A balanced equation showing nuclear fission of Uranium nucleus is

_{92}U^{235} + _{0}n^{1} → _{56}Ba^{141} + _{36}Kr^{92} + 3(_{0}n^{1}) +200MeV.

(Uranium) (Barium Krypton)

(ii)

1. To maintain the steady rate of fission, the neutron absorbing material known as controller is used. The controller rods are made of cadmium.

2. A moderator is a suitable material to slow down neutrons produced in the fission. For this the moderator rods are graphite rods.

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42.
Starting with N = N_{0}e^{-λt}, obtain a relation between disintegration constant ‘λ’ of a radioactive element and its half life (T), various terms have their usual meaning.

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43.

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.

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44.
Calculate:

i) Mass defect of helium and

ii)

i) Mass defect of helium and

ii)

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

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45.
Draw a labelled diagram of a common emitter amplifier. What is the phase angle between the input and output voltages?

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46.
Threshold wavelength of a certain metal is 792 nm. What is the maximum kinetic energy of photo-electrons emitted by this metal if it is exposed to ultraviolet light of wavelength 396 nm?

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47.
The following combination of gates acts as a logic gate. With the help of a truth table, find out which logic gate the combination represents:

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