question_answer

A stone is dropped into a well, if the depth of water below the top be h and the velocity of sound is  \[{{a}_{c}}={{k}^{2}}{{r}^{2}}{{t}^{2}},\], then the splash in water is hear after T sec. Then,

A)  \[2mk{{r}^{2}}t\]            

B)  \[mk{{r}^{2}}{{t}^{2}}\]

C)  \[m{{k}^{2}}{{r}^{2}}t\]                               

D)  \[m{{k}^{2}}r{{t}^{2}}\]