Two rods are both made of pure titanium. The diameter of rod A is twice the diameter of rod B, but the lengths of the rods are equal. You tap on one end of each rod with a hammer and measure how long...

Two rods are both made of pure titanium. The diameter of rod A is twice the diameter of rod B, but the lengths of the rods

are equal. You tap on one end of each rod with a hammer and measure how long it takes the disturbance to travel to the

other end of the rod. In which rod did it take longer?

(A) Rod A

(B) Rod B

(C) The times were equal