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19.b as gravitational force is inversely prop to r^2
20.c. as i=r
21.d
22.b
23.b
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Explanation:
19 (b) Increases because distance between centres of two object (r) is inversely proportional to the Gravitational force (Fg)
20 (d) doesn't get refracted due to Fermat's Principle of least time.
21 (d)
22 (b)
23 (d) diffusion because the when the water molecules interect with the potassium permaganate crystals, the kinetic energy of crystals interacting with the water increases .
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