Question

Fig. shows three ways in which a string of length l in an instrument can vibrate.

(i)	(ii)	(iii)

1. Which of the diagram shows the principle note?
2. Which vibration has the frequency four times that of the first?
3. Which vibration is of the longest wavelength?
4. What is the ratio of the frequency of the vibration in (i) and (ii)?

Answer 1

1. (i) represents the principal note.
2. (iii) has the frequency four (4) times of the first.
3. In Figure (i), vibration is of the longest wavelength.
4. Ratio of frequency between (i) and (ii) 1 : 2