Waves - Result Question 15
15. A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance $1.21 \AA$ between them. The wavelength of the standing wave is
(a) $1.21 \AA$
(b) $2.42 \AA$
(c) $6.05 \AA$
(d) $3.63 \AA$
[1998]
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Answer:
Correct Answer: 15. (a)
Solution:
- (a) Let $\ell$ be length of string
$ \ell=(\frac{\lambda}{2}) 2 \Rightarrow \lambda=\ell $
Hence, the wave length of standing wave
$\Rightarrow \lambda=\ell=1.21 \AA$
