In a Geiger counter, a thin metallic wire at the center of a metallic tube is kept at a high voltage with respect to the metal tube. Ionizing radiation entering the tube knocks electrons off gas molecules or sides of the tube that then accelerate towards the center wire, knocking off even more electrons. This process eventually leads to an avalanche that is detectable as a current. A particular Geiger counter has a tube of radius R and the inner wire of radius a is at a potential of Vo volts with respect to the outer metal tube. Consider a point P at a distance s from the center wire and far away from the ends. Required:
a. Use Vo = 900 Va = 3.00 mm, R = 2.00 cm, and find the value of the electric potential at a point 1.00 cm from the center of the wire (with respect to the outer metal tube).
b. Find a formula for the electric potential at a point P inside.
c. Use Vo = 900 V, a = 3.00 mm, R = 2.00 cm, and find the value of the electric field at a point 1.00 cm from the center.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

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.

the doppler effect is used by weather forecasters to measure 

moving clouds