Course:PHYS341/2018/Assignments/A5

For Quiz 5 on Feb. 9th.

1 A harp string has a fundamental frequency of 100 Hz (approx. G2, in musical notation). If it is plucked in the centre, what frequencies do you expect to show up in the sound spectrum?

	(a) 100 Hz only.
	(b) 200 Hz only.
	(c) 100, 200, 300, 400 Hz...
	(d) 100, 300, 500, 700 Hz...
	(e) 200, 400, 600 Hz.....
	(f) 200, 600, 1000 Hz.....

2 A guitar string has a fundamental frequency of 100 Hz (approx. G2, in musical notation). If it plucked one seventh of the way along the string with a thin plectrum, what frequencies do you expect to show up in the sound spectrum?

	(a) 700 Hz only.
	(b) 700, 1400, 2100 Hz ...
	(c) 700, 2100, 3500 Hz ...
	(d) 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 Hz ...
	(e) 100, 200, 300, 400, 500, 600, 800, 900, 1000 Hz ...
	(f) 100, 200, 300, 400, 500, 600, 700 Hz only

3 A qin string has a fundamental frequency of 100 Hz (approx. G2, in musical notation). If it plucked one seventh of the way along the string and touched lightly a third of the way along the string, what frequencies do you expect to show up in the sound spectrum?

	(a) 700 Hz only.
	(b) 700, 1400, 2100 Hz ...
	(c) 700, 2100, 3500 Hz ...
	(d) 300, 600, 900 Hz ...
	(e) 300, 400, 500, 600, 800, 900, 1000 Hz ...
	(f) 300, 400, 500, 600, 700, 800, 900, 1000 Hz ...

4 Playing the violin with the bow sul ponticello (i.e. close to the bridge) produces a brighter, harsher sound than playing sul tasto (i.e. bow over the fingerboard, further from the bridge) because:

	(a) Exciting any string closer to one end produces stronger high frequency harmonics.
	(b) The bow scrapes on the bridge.
	(c) You are bowing over the sound holes.
	(d) When playing sul tasto, the fingerboard absorbs sound.
	(e) Its all part of the magic of the violin.