Question

A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance $1.21$ $�$ between them. The wavelength of the standing wave is

• A. $6.05$ $�$
• B. $2.42$ $�$
• C. $1.21$ $�$
• D. $3.63$ $�$

Answer 1

Answer: (C)

$1.21$ $�$

Answer 2

Distance between a node and adjoining antinod
$=\lambda/4$

From figure, distance between two atoms
$=4\times\frac{\lambda}{4}=1.21$ $�$ or, $\lambda=1.21$ $�$.