Exercises - Form IV - WAVES - ACTIVITY 4

ACTIVITY 4

1.       (a) What governs then pitch of a note emitted by a stretched string?

(b) How may the loudness be increased?

2.       When the wire of a sonometer is plucked it vibrates, emitting a note. State the effect on the Fundamental frequency of this note, if

                        i.            The length of the wire was halved with no change in the tension.

                      ii.            The tension was made four times as large, with the original length unchanged

                    iii.            The wire replaced by one of mass per unit length four times as the large, the length and tension being the same.

3.       A string of length 1.2 m is stretched and made to vibrate so that a stationary wave consist string of two loops is produced.

a)       Draw a sketch of the wave

b)      Determine the wavelength of the wave.

4.       A wire of length 20 cm and mass 1.2 g is under a tension of 120 N. Determine

a)       The Fundamental frequency of vibration

b)      The frequency of the third harmonic

c)       The third and fourth overtones

5.       Describe characteristics of musical sound.