A) ?1 to \[\frac{1}{2}\]
B) \[-\frac{3}{4}\] to \[-\frac{1}{2}\]
C) \[-\frac{1}{2}\] to 1
D) 1 to 2
Correct Answer: A
Solution :
\[Y=3K(1-2\sigma ),\ Y=2\eta (1+\sigma )\] For \[Y=0,\] we get \[1-2\sigma =0\], also \[1+\sigma =0\] \[\Rightarrow \sigma \] lies between \[\frac{1}{2}\] and \[-1\].
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