Answer:
A) compression B) rarefaction C) wavelength
Explanation:
The answer for your problem is shown on the picture.
Answer:
The state of being free from the effects of gravity.
Here if we assume that there is no air friction on both balls then we can say

now the acceleration is given as


so here both the balls will have same acceleration irrespective of size and mass
so we can say that to find out the time of fall of ball we can use


now from above equation we can say that time taken to hit the ground will be same for both balls and it is irrespective of its mass and size
The answer for that would be C