For a progressive wave, state the meaning of the period.
For a progressive wave, state the meaning of the wavelength.
Fig. 4.1 shows how displacement $x$ varies with time $t$ for two progressive waves P and Q passing the same point. Their speed is $20\,\text{cm s}^{-1}$.
Calculate the waves’ wavelength.
Determine the phase difference for the two waves.
Calculate the ratio formed by $\dfrac{\text{intensity of wave Q}}{\text{intensity of wave P}}$.
As the two waves pass the same point, they superpose. Use Fig. 4.1 to find the resultant displacement at time $t = 0.45\,\text{s}$.
Determine the phase difference between the two waves.
Calculate the ratio $\dfrac{\text{intensity of wave Q}}{\text{intensity of wave P}}$.
Because the two waves superpose at the same point, use Fig. 4.1 to work out the resultant displacement at time $t = 0.45\,\text{s}$.