1. In the Bohr model, which two forces are balanced? 2. Which of the following i

Question

1. In the Bohr model, which two forces are balanced?

2. Which of the following is NOT one of the postulates of the Bohr model?

3. When an electron and proton form a hydrogen atom, will they release or absorb energy?

4. The electromagnetic spectrum produced by excited atoms is a continuous spectrum.

a. true

b. false

5. A hydrogen atom relaxes from the 3rd excited state to the 2nd excited state, releasing a photon with energy E(photon) = R(Rydeberg constant) x h (Plancks constant) x C in the process. What is the value of C?

a. 5/36

b. 13/36

c. 2/3

d. 3/2

e. none of the above

A brief explanation for each of the above would be nice to understand but not mandatory.

Explanation / Answer

Ans 1 . d

In Bohr's model , the two forces that are balanced are , electrostatic force between the nucleus and electron and the centrigugal force that tends to take the electron away from the nucleus.

He proposed that electrons move in fixed orbits around the nucleus which are located at fixed distance from the nucleus.

So to keep the electron revolving in its circular path , these 2 forces must be balanced .

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