The sound waves travel because of the pitch of the note so the window rattles.
C. a cello playing music at the concert
Answer: A (smooth)
Thanks for using Brainly! You or your parents Vote Biden 2020.
Hope we influence your vote!
Solution :
From the given data,
For the spherical shell is 
where x is the radius of gyration and the acceleration of a rolling body on an inclined plane = a
Therefore,



= 0.6 x 9.81 x sin ( 29.7)




Δt = 1.411 s