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

1. 1.21 Å
2. 2.42 Å
3. 6.05 Å
4. 3.63 Å

Correct answer: 2.42 Å

Solution

A standing wave with 3 nodes and 2 antinodes corresponds to one full wavelength fitting between the two atoms. The distance between the atoms is 1.21 Å, which represents half a wavelength. Therefore, the full wavelength is 2 × 1.21 Å = 2.42 Å.

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