An experiment isconducted in which red light is diffracted through a singleslit. Then, each of the following alterationsto the original experiment is made, one at a time, and theexperiment is repeated. After each alteration, the experiment isreturned to its original configuration. A The slit width is halved. B The distance between the slits and the screen is halved. C The slit width is doubled. D A green, rather than red, light source is used. E The experiment is conducted in a water-filled tank. F The distance between the slits and the screen is doubled.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.