Awave front has the form of a a. sine wave. b. circle. c. surface of a sphere. d. straight line.

Answer;

Surface of a sphere

Explanation;A wave is a transmission of a disturbance from a given point to another. it involves the transfer of energy from a particular point to another and involves vibration of particles along the medium of transmission. A wave front refers to an imaginary surface of a wave that corresponds to the points of a wave that are vibrating together. Wave fronts may take three forms, namely; spherical, plane or cylindrical. The plane wave front takes the simplest form, such that the wave rays are parallel to one another. An example of a spherical wave front is when the light from the sun strikes the earth at a spherical wave front.

490 n  f=125n a=2.5m/s2