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how does gravity affect ANYTHING, no one really knows the medium at which gravity is transfered so therefore how can we correctly depict HOW anything is affected by gravity...
althogh you can answer the question "what are the effects of gravity on light and sound?" which would be answered by, a ray of light is acted upon by a gravitational force, this is only noticed around very massive objects such as dense decaying stars and blackholes where two images of the same star can be seen because two rays of light are bent toward your eye. Sound on the other hand is just wave changes in air pressure, air pressure in the atmosphere does depend on the gravitational force of the earth in order to exist, but changes in this pressure is merely just the interaction between many air molecules. So no sound is not affected by air unless you take into account the speed of sound increasing as the density of the air increased which would increase slightly the higher pressure of air you had in a certain volume of space which would depend on the gravitational force from the body of mass which is enclosed by these particles of gas. (I think the subject in the preceeding paragraph is interesting b/c i have never thought of a stronger acceleration due to gravity on the surface of a planet increasing the speed of sound on that planet, someone please comment on this, i would love to hear more.)
but with that aside the answer to how gravity affects these is ultimately unknown. Newton said that the gravitational force existed between any two bodies of mass, but the fact that electromagnetic waves (composed of MASSLESS photons) are affected by gravity crushes this theory. Einstein's General Relativity on an elementry level states that the presence of matter bends the fabric of space causing massive objects and rays of electromagnetic waves to diolate their perception of "straight" on this coordinate system thus bending the path at which they follow in relation to our flat perception of straight. This theory works with common day understanding but it still does not explain the HOW. The theory of the undiscovered graviton has come about in recent years.. recent as in a few decades ago. Think about it this way, if intensity of electromagnetic waves is proportional to the inverse square of the spherical radius away from the center point and electromagnetic waves are made up of massless packets of energy (photons) then this is also a perfect model for a MUCH weaker and far harder to detect graviton which also follows the identical inverse square law but with a far less constant of proportionality.
So HOW gravity works, is not really known, but the effects of gravity on different things has been stated.
T_00 = density of mass-energy
T_a0 = density of a-component of momentum
T_0b = b-component of energy flux
T_Ab = a, b component of "stress" = b-component of flux of a-component of momentum = a-component of force produced by fields and matter at x^b-e acting on fields and matter x^a+e across a unit surface, the perpendicular to which is e_b, the unit vector in the b direction.