A beam of light has a wavelength of 1 x 10^-7m what type of light is it

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.