In the Bohr model of the hydrogen atom, a single electron revolves around a single proton in a circle of radius r. Assume that the proton remains at rest. A) By equating the electric force to the electron mass times its acceleration, derive an expression for the electron's speed. Express your answer in terms of electron's charge e, its mass m and orbit radius r. Express your answer in terms of the given quantities and appropriate constants.
B) Obtain an expression for the electron's kinetic energy. Express your answer in terms of the given quantities and appropriate constants.
C) Show that the electron's kinetic energy is just half that of the electric potential energy using your words. (I have no idea on this one, I assume it helps to answer B)
D) Obtain an expression for the total energy. Express your answer in terms of the given quantities and appropriate constants.
E) Calculate the total energy using r=5.29×10−11m. Give your answer in joules.
F) Give the answer of part (d) in eV.

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

because growing process had stoped after 4-5 year