A) 30°
B) 60°
C) 90°
D) 120°
Correct Answer: D
Solution :
Let two simple harmonic motions are \[v{{(4/3)}^{1/2}}\] and \[v{{(4/3)}^{1/2}}\] In the first \[2\to 1\] \[L{{i}^{+}},H{{e}^{+}}\]\[_{\text{90}}\text{T}{{\text{h}}^{\text{228}}}\] In the second case,\[_{83}\text{B}{{\text{i}}^{212}},\] \[\alpha \]\[\text{ }\!\!\beta\!\!\text{ -}\] \[\text{8}\alpha \text{,7 }\!\!\beta\!\!\text{ }\]\[4\alpha \text{,7 }\!\!\beta\!\!\text{ }\]\[4\alpha \text{,4 }\!\!\beta\!\!\text{ }\]\[4\alpha \text{,1 }\!\!\beta\!\!\text{ }\] \[C{{u}^{64}}\]\[{{B}_{H}}=0.3\times {{10}^{-4}}Wb/{{m}^{2}}\] \[{{B}_{H}}=0.1\times {{10}^{-5}}.\]\[0.25\times {{10}^{-6}}T\] On solving we get \[0.36\times {{10}^{-6}}T\]or\[0.66\times {{10}^{-8}}T\]i.e.,\[1.2\times {{10}^{-6}}T\]or\[4x{{10}^{3}}\]
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