Q53 of 106 Page 384

Calculate the energy that can be obtained from 1 kg of water through the fusion reaction

2H + 2H →3H + p.


Assume that 1.5 × 10–2% of natural water is heavy water D2O (by number of molecules) and all the deuterium is used for fusion.


Given, 18g of molecules contain 6.023× 1023atoms

1kg of molecules contain atoms


% of deuterium atoms=No. of atoms in 1kg of water× % of deuterium



Energy of deuterium



= 1507mJ


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41

A vessel of volume 125 cm3 contains tritium (3H, t1/2 = 12.3 y) at 500 kPa and 300 K. Calculate the activity of the gas.

 50

Calculate the Q-values of the following fusion reactions:

(a)


(b)


(c)


Atomic masses are = 2.014102 u, = 3.016049 u, = 3.016029 u, = 4.002603 u.


 1

The Bohr radius is given by, .Verify that the RHS has dimensions of length.

 2

Find the wavelength of the radiation emitted by hydrogen in the transitions A. n=3 to n=2, B. n=5 to n=4 and

C. n=10 to n=9.