College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 110

Fred strikes a steel train rail with a hammer at a frequency of 2.50 Hz, and Wilma puts her ear to the rail 1.0 km away. (a) Flow long after the first strike does Wilma hear the sound (b) What is the time interval between the successive sound pulses she hears [ Hint : See Tables 9.1 and 9.2 and Exercise.]
Exercise
The speed of longitudinal waves traveling in a long, solid rod is given by
, where Y is Young's modulus and is the density of the solid. If a disturbance has a frequency of 40 Hz, what is the wavelength of the waves it produces in (a) an aluminum rod and (b) a copper rod [ Hint : See Tables 9.1 and 9.2.]