Chapter 2: Quants and Atoms

Question 1

What’s the problem with Light?

Answer 1

The problem with light is it has the characteristics of both waves and particles.

Question 2

How would a recording machine graph detection of photons?

Answer 2

It would show up in bursts because light behaves like particle instead of one continuous stream-

Question 3

What is the formula for the energy in photons?

Answer 3

Energy of Photon = h (Plank’s Constant) x f (Frequency in Hz)

Question 4

What is the Plank’s constant?

Answer 4

6.626 x 10 (to the power of -34) J/s

Question 5

What’s special about different colors of Photons?

Answer 5

Different colors of photons have different frequencies. For example, a violet photon has a frequency of 7.5 x 10 (To the power of 14)

Question 6

What is Quantization?

Answer 6

It is similar to when you buy eggs you have to buy them in groups of 12 or as a dozen.

Here in this case the amount of eggs are quantized because he can’t choose between the amount of eggs.

Question 7

What is the alphabet value of each election shell?

Answer 7

Shell 1 = K-Shell
Shell 2 = L-Shell
Shell 3 = M-Shell
Shell 4 = N-Shell

Question 8

What is the first postulate by Bohr?

Answer 8

Electron its own shell does not lose or gain energy. It loses or gains energy when it jumps from one shell to another.

Question 9

What is the second postulate by Bohr?

Answer 9

Electron loses energy when it jumps from a higher shell to a lower shell. Electrons gain energy when it jumps from a lower shell to a higher shell.

Question 10

What is the formula for angular momentum in the shell?

Answer 10

The formula is L = nh/2pi where n =1,2,3,4…

Question 11

What is the angular momentum formula for shell equal to?

Answer 11

It is equal to L=mvr where m is the mass of electrons, v is the velocity of electrons, and r is equal o the radius of the shell.

Question 12

What is the angular momentum formula for shell equal to?

Answer 12

It is equal to L=mvr where m is the mass of electrons, v is the velocity of electrons, and r is equal o the radius of the shell.

Question 13

What is the electrostatic force found in the atom equal to?

Answer 13

The centripetal force is provided by electrostatic force between electrons and the nucleus. There ForceC = ForceE

Question 14

What is the formula used to measure the energy in the hydrogen atom?

Answer 14

Energy of electron = Rh/n(2)

Question 15

What is Rh in the hydrogen energy formula?

Answer 15

Rh is the Rydberg concept which means that it has the value 2.179 x 10(-18) J

Question 16

How to modify that formula so we measure the change in energy of the hydrogen atom?

Answer 16

Change in energy of electron = Rh (1/n final (2) - 1/n initial (2))

Question 17

How does a hydrogen atom’s electron go up or down a level?

Answer 17

For an electron to move up levels it has to absorb a photon, however, they also shoot out a photon when they lose a level.

Question 18

Do the photons that get released from atoms have different lights?

Answer 18

When going from 5 to 2 or 3 to 1 the photons that got released have different lights.

Question 19

How to calculate the wavelength of the photon released?

Answer 19

We can use the formula 1/λ = RZ(2) (1/n final (2) - 1/n initial (2))

λ is the wavelength of the photon, R is the rydberg constant, Z is the atomic number of that element.