[填空题]
Two strings on a musica8 qyb1s h+k-hug- 9ki:cox3k lvm- 0 7evu 1(6*d 6cbantdeocwl instrument are tuned to play at 392 Hz (G) and 440 Hz (Ae- 6 6cu ce7vmnd10 (obtwv*da).
(a) What are the frequencies of the first two overtones for each string? G : $f_2$= Hz $f_3$= Hz A : $f_2$= Hz $f_3$= Hz
(b) If the two strings have the same length and are under the same tension, what is the ratio of their masses ($m_{\mathrm{G}}/m_{\mathrm{A}}$)
(c) If the strings instead have the same mass per unit length and are under the same tension, what is the ratio of their lengths($L_{\mathrm{G}}/L_{\mathrm{A}}$)
(d) If their masses and lengths are the same, what must be the ratio of the tensions in the two strings?
