Question

If the distance between a crest and its consecutive trough for a sound wave is $L$, then its wavelength is given by :

• A. $L/2$
• B. $L$
• C. $4L$
• D. $2L$

Answer 1

The correct option is D $2L$

The wavelength of the sound wave is the distance between two consecutive crests or two consecutive troughs. The sound wave is periodic. So the length of the crests or trough are always same. Here, it is given that the distance between a crest and its consecutive trough foe a sound wave is $L$. So, its wavelength is $2L$.