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Nuclear Physics Nat Level – 1 - Question 1

The half life of a radioactive substance is 3*h* and its activity is 1µ*Ci*. Then the activity after 9*h* will be (in µ*Ci*)

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Nuclear Physics Nat Level – 1 - Question 2

An electron positron pair (rest mass of each particle = 0.51 MeV) is produced by a γ -ray photon of energy 2.42 MeV. The K.E. (in MeV) imparted to each of the charged particles shall be :

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Nuclear Physics Nat Level – 1 - Question 3

The probability of a radioactive atoms to survive 5 times longer than its half value period is.

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Nuclear Physics Nat Level – 1 - Question 4

A radioactive nuclie decay as follows If mass number and atomic number of *A* are 180 and 72 respectively then atomic number for *A*_{4} will be.

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Nuclear Physics Nat Level – 1 - Question 5

After emission of an α -particle by a radioactive element _{84}X^{212}, the resulting mass number would be.

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Nuclear Physics Nat Level – 1 - Question 6

If the mass of proton = 1.008 amu and mass of neutron = 1.009 amu then binding energy (in MeV*)* per nucleon for _{4}Be^{9} (mass = 9.012 amu) would be :

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Nuclear Physics Nat Level – 1 - Question 7

After a time equal to four half lives, the percentage of radioactive material remaining undecayed is :

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Nuclear Physics Nat Level – 1 - Question 8

The half-life of cobalt 60 is 5.25 years. How long after a new sample is delivered, will the activity have decreased to about one third (1/3) of its original value. (Provide the time in years).

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Nuclear Physics Nat Level – 1 - Question 9

The mean life of a radioactive sample is 100 years. Then after 100 years, what percentage of the sample remains active.

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Nuclear Physics Nat Level – 1 - Question 10

10^{14} fissions per second are taking place in a nuclear reactor having efficiency 40%. The energy released per fission is 250 MeV. The power output (in Watts) of the reactor is :

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