Wave Motion
pg 443 Problems 51-55 all

51.

• D - all of the preceding

52.

• A:  l = v/f which when solved for v becomes v = fl

53.

	longitudinal	transverse	elliptical	torsional
solids	X	X both mechanical and non-mechanical		X
liquids	X	X only non-mechanical	X
gases	X	X only non-mechanical

54. 

• 8.5 x 10^-2 meters

Use v_w = fl where v_w = 340 m/sec and f = 4.0 x 10³ hz

340 = 4.0 x 10³ l
l = 340 /  4.0 x 10³
l = 8.5 x 10^-2 meters

55.

• 20 m/s

Use v_w = fl where l = 0.5 m and f = 40 hz

v_w = (40)(0.5)
v_w = 20 m/sec