Evaluate :
cos(40°-theta) - sin(50°+theta) + cos^2 20+cos^2 50/ sin^2 40+sin^70 + cot30°cos38°cosec52°/sin15°tan60°sec75°
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Suppose a
88
226
Ra nucleus at rest and in ground state undergoes α-decay to a
88
222
Rn nucleus in its excited state. The kinetic energy of the emitted α particle is found to be 4.44MeV.
86
222
Rn nucleus then goes to its ground state by γ-decay. The energy of the emitted γ photon is ____ keV..
[Given : atomic mass of
88
226
Ra=226.005u, atomic mass of
88
222
Rn=222.000u, atomic mass of α particle = 4.000u,1u=931MeV/c
2
,c is speed of light]
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