An observer on the seashore sees waves reaching the shore, what type of waves does the observer see? Why?
Answer
Eliptic waves, while transverse wave occurs at the surface of water, but longitudinal wave occurs just below the water surface. Hence the resulting waves will be eliptical
The weight hanging from the sonometer wire is increased by a factor of weight. Will the frequencies of the wire increase by exactly a factor of two? Explain your answer.
Answer
No, there will be a very slight increase in length of the wire, so the frequency will be slightly less by a factor of two.
Tone of open pipe is softer then tune of close pipe, why?
Answer
Close pipe have only odd harmonic while open pipe have both (odd and even) harmonic. Generated harmonic in open pipe is greater then generated harmonic in close pipe. So it has soft tone.
Between the first and fifth nodes is 40 cm then find wavelength of wave?
Answer
We know that distance between two consecutive nodes is $\frac{\lambda}{2}$. So first and fifth between distance $\frac{4 \times \lambda}{2}$ Means it is equal to $2 \lambda$. $\therefore \quad 2 \lambda=40 \quad \therefore \lambda=\frac{40}{2}=20 cm$
