Question

When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of $10cm$. What is the wavelength of the sound wave?

• A. $0.4cm$
• B. $1.3cm$
• C. $3.3cm$
• D. $2.5cm$

Answer 1

The correct option is C $3.3cm$

Wavelength ($\lambda$) is the distance between two consecutive crests or troughs in a sound wave.
Given that four consecutive troughs constitute a distance of $10cm$.


From the figure, $3\times \lambda =10cm$
$⟹$ Wavelength, $\lambda =\frac{10}{3}\approx 3.3cm$