A 200 Kg Mass Is Attached to the End of a a 1.00

Multiple Choice

A 20.0 kg mass is attached to the end of a 1.00 m long steel rod, which has a diameter of 1.00 mm and negligible mass. The mass at the end is pulled, stretching the rod slightly, and then released. If the elastic modulus of steel is 2.00 × 10¹¹ N/m², then the frequency of the resulting oscillations is

A) 37.2 Hz.
B) 30.4 Hz.
C) 24.5 Hz.
D) 20.1 Hz.
E) 14.1 Hz.