A 100 Hz sound wave is traveling through the air. If we increase the frequency to 200 Hz, this will ________ the wavelength.
A. 
quadruple (4 x) 

B. 
cut in half (1/2 X) 

C. 
double (2 x) 

D. 
not change (stay the same) 
Two identical objects, each with a mass M, are attached to each other via a spring with a spring constant k. The two objects are oscillating such that one is always moving in the opposite direction and with the same speed as the other. If the spring were replaced with a stiffer spring having a spring constant equal to 2k, and the objects were replaced with objects having a mass of 2M, the period of oscillation would
A. 
Quadruples (4 X) 

B. 
Cut in half (1/2 X) 

C. 
Remain the same 

D. 
Double (2 X) 
need the key answer please !!!
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