Which of the following statements is untrue in regard to sound traveling in air? a. as the distance from the earth increases, the sound wave intensity also decreases due to the lessening density. b. the area covered by the wave front increases as the wave advances, but the energy passing through a wave front in a unit of time decreases. c. during a single vibration of the diaphragm, molecules in the air near it will also complete one vibration. d. sound waves in the air are transverse and consist of compressions and rarefactions of air molecules.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.