Ametallic sheet has a large number of slits, 5.0 mm wide and 20 cm apart, and is used as a diffraction grating for microwaves. a wide parallel beam of microwaves is incident normally on the sheet. what is the smallest microwave frequency for which only the central maximum occurs? (c = 3.00 × 108 m/s) a metallic sheet has a large number of slits, 5.0 mm wide and 20 cm apart, and is used as a diffraction grating for microwaves. a wide parallel beam of microwaves is incident normally on the sheet. what is the smallest microwave frequency for which only the central maximum occurs? (c = 3.00 × 108 m/s) 1.5 ghz 2.0 ghz 0.50 ghz 1.0 ghz 0.70 ghz

b. latent learning (the word "latent" itself means something that exists but isn't obvious, only under certain conditions! )

think its the third option

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.

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