A standing wave having $3$ nodes and $2$ antinodes is formed between two atoms having a distance $1.21\;\mathring A$ between them. The wavelength of the standing wave is .... $\mathop A\limits^o $
A$1.21$
B$2.42 $
C$6.05$
D$3.63 $
AIIMS 2000,AIPMT 1998, Easy
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A$1.21$
a (a) $\lambda = 1.21{Å}$
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