Course:PHYS341/2018/Assignments/A7

Self-study for Quiz 7 on March 9th.

1 If a complex tone consists of frequencies 200, 300, 400, 500 and 600 Hz, you perceive a pitch associated with what frequency?

	(a) 100 Hz
	(b) 200 Hz
	(c) 400 Hz
	(d) 600 Hz
	(e) 1 kHz
	(f) 2 kHz

2 The top two strings of a violin should be tuned to just temperament fundamental frequencies 440 and 660 Hz. If they are tuned to 441 and 660 Hz and if the two strings are bowed together, what beat frequency will be heard? Reminder: the beat frequency is the difference between two close frequencies. (Warning: think what is going on here!).

	(a) 1 Hz
	(b) 2 Hz
	(c) 3 Hz
	(d) 219 Hz
	(e) 441 Hz
	(f) 660 Hz

3 String instruments often have a hole (or holes) because (three good reasons):

	(a) The sound echoes in the hole.
	(b) The hole lets the sound out of the box.
	(c) The air in the neck of the hole radiates sound well at low frequencies.
	(d) The hole adds an extra low resonance to the sound box related to the Helmholtz "beer bottle" resonance.
	(e) The hole lowers the lowest frequency of the sound box without having to thin the sound board too much.
	(f) The hole allows you to look inside to see how well the instrument is made.