Question

The given graph shows the displacement versus time relation for a disturbance travelling with a velocity of $1200{\text{m s}}^{-1}$. Calculate the wavelength of the disturbance in $\text{mm}$.

• A. 2.4

Answer 1

The correct option is A 2.4
From the graph,

Time period, $\text{T}=2\times {10}^{-6}\text{s}$

Wavelength, $\lambda =\frac{\text{Speed (v)}}{\text{Frequency (f)}}=\text{v}\times \text{T}$

$\Rightarrow \lambda =1200\times 2\times {10}^{-6}$

$=2.4\times {10}^{-3}\text{m}=2.4\text{mm}$