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

Options

A. 1.21 Å
B. 1.42 Å
C. 6.05 Å
D. 3.63 Å

Answer

A

Explanation

Key Idea The given standing wave has segments.
The given standing wave is shown in the figure.

As length of one loop or segment is `(lambda)/(2)`, so length of 2 segments is 2 `((lambda)/(2))`
`therefore 2(lambda)/(2)=1.21Å`
`Rightarrow lambda=1.21Å`