The diagram shows a ripple tank
lamp
motor
water
white card
(a)
the motor makes a noise when it is turned on
describe the differences between the prope
motor and the water waves in the ripple tank
en the properties of the sound waves produced by the

c)as speed changes, wavelength and frequency change.

everything changes!

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.