I think it's 16.8 because you multiply 5.6x3=16.8
Physics can be used in a variety of ways, a specific example would be rollercoaster. Physics can be used to determine the speed at which a rollercoaster can travel without going off the rails or when it needs to begin to slow down to make a sharp turn.
As we know that the pitch of sound is directly proportional to the frequency as the frequency increases the pitch of sound increases and wavelength decreases
so the correct option is B
hope it helps<span />
