There are two water waves (velocity 16 m/s) which arrive at point P, where a duc

Question

There are two water waves (velocity 16 m/s) which arrive at point P, where a duck is sitting. The first wave comes from the north with amplitude 3 m and wavelength 60 m. The second wave comes from the west with amplitude 4 m and wavelength 60 m. What is the amplitude of the duck's oscillation? (choose the best answer) A. 1.0 m B. 3.5 m C. 7.0 m D. Anywhere between 1.0 and 7.0 m depending on the relative phase of the waves Sound is an example of a wave whose particles vibrate parallel to the direction of travel. Which type of wave is sound? A. transverse B. longitudinal C. electro-mechanical D. all of the above E. none of the above

Explanation / Answer

1) For destructive interference of the waves, the amplitude of oscilation will be 4-3=1 m

For constructive interference of the waves, the amplitude of oscillation will be 4+3=7m

Since we do not know the actual phase difference when the waves reach the duck, the answer is option D. The answer can be anything between 1 and 7m depending on the relative phase of the waves

2) Answr is option B. By definition of longitudinal waves, the particles vibrate along the direction of the wave in case of longitudinal wave and therefore sound is a type of longitudinal wave

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