Question

In a ripple tank, $10$ full ripples/s are produced. The distance between peaks of consecutive trough and crest is $15cm$. Calculate the wavelength.

• A. $0.15m$
• B. $0.3m$
• C. $0.45m$
• D. $0.6m$

Answer 1

The correct option is B $0.3m$

Wavelength is the distance between consecutive corresponding points of the same phase, such as crests, troughs, compressions, rarefactions or zero crossings and is a characteristic of both traveling waves and standing waves, as well as other spatial wave patterns. Wavelength is commonly designated by the Greek letter lambda ($\lambda$).
In the question, it is given that the distance between peaks of consecutive trough and crest is 15 cm, that is half the wavelength $\frac{\lambda }{2}$.

Hence, the total wavelength is $15\times 2=30$ cm = 0.3 meters.