Question

Plucking a cello string might cause it to vibrate back and forth 200 times each second. The sound heard is a low pitch of 200 cycles per second, or 200 hertz. If sound travels at 1116 ft/sec, what is the wavelength (in ft and m) and energy (joules and kcal) of this note?

Answer 1

Thu freauenea ofthe sont 2U0 H2 The velotiadotthe souns ()-1116t/s The wave len g th of the soun! 111 6 200 = 5.58t Now 1ft o.305 m The ener hplank coustant E- h h - 6625x1039 200 J, =325 x10-32 1324 2Cl K eal 5. 5 65 x 10 57, E