Chapter 7

Question 1

What is a form of electromagnetic radiation we can see?

Answer 1

Light

Question 2

What are some forms of electromagnetic radiation we cannot see?

Answer 2

Microwaves, radio signals, x-rays

Question 3

Most subatomic particles behave as ___________ an obey the physics of waves.

Answer 3

Particles

Question 4

What are parts of zero amplitude?

Answer 4

Nodes

Question 5

What is the length between crests of different waves?

Answer 5

Wavelength

Question 6

The height of the wave from zero amplitude is what?

Answer 6

Amplitude

Question 7

Waves also have ____________.

Answer 7

Frequency

Question 8

What Greek letter do we use for frequency?

Answer 8

nu or V

Question 9

What are the units of nu “V”?

Answer 9

Cycles per second

Question 10

All electromagnetic radiation has what equation?

Answer 10

Wavelength x frequency = the speed of light

Question 11

What is the speed of light?

Answer 11

3.00 x 10^8 m/sec

Question 12

Long wavelength = _________ frequency.

Answer 12

Small

Question 13

Short wavelength = _________ frequency

Answer 13

High

Question 14

Who solved the ultraviolet catastrophe?

Answer 14

Max Planck

Question 15

Max Planck discovered that an object can gain or lose energy by absorbing or emitting ____________ energy in quanta.

Answer 15

Radiation

Question 16

What is quanta?

Answer 16

Discrete specific amounts of energy

Question 17

The energy of radiation is proportional to the ___________.

Answer 17

Frequency

Question 18

What is Plancks equation?

Answer 18

E = n x h x v
(h plancks constant)
(n is quantum numbers)

Question 19

When wavelength increases energy (intensity) also ___________.

Answer 19

Increases

Question 20

Light with large wavelengths has _________ energy.

Answer 20

Small

Question 21

Light with short wavelengths has _________ energy.

Answer 21

Large

Question 22

Who explained the photoelectric effect using and experiment to demonstrate the particle nature of light?

Answer 22

Einstein

Question 23

There were no ejected electrons observed until light of a certain minimum __________ is used. (Or minimum frequency)

Answer 23

Energy

Question 24

Once minimum energy is obtained, the number of electrons ejected depends on the what?

Answer 24

Light intensity (number of photons)

Question 25

Particles of electromagnetic energy whose energy is proportional to the frequency of the radiation is called what?

Answer 25

Photons

Question 26

Bohr’s greatest contribution to Science was building a simple model of the ________.

Answer 26

Atom

Question 27

Bohr’s model of the atom was based on an understanding of what?

Answer 27

Sharp line spectra of excited atoms

Question 28

Line spectra of excited atoms: Excited atoms emit light of only certain _______________.

Answer 28

Wavelengths

Question 29

Line spectra of excited atoms: The wavelengths of light emitted depends on the ___________.

Answer 29

Element

Question 30

Visible atoms in the H-atom spectrum are called the what?

Answer 30

Baller series

Question 31

The new theory Bohr came up with for electron orbit is called the what?

Answer 31

Quantum or wave mechanics

Question 32

Electrons can exist only in certain discrete orbits called what?

Answer 32

Stationary states

Question 33

Electrons are restricted to quantized energy states called what?

Answer 33

Energy levels

Question 34

What is the energy of states equation?

Answer 34

En=-RH/n^2

Question 35

The energy is state equation is also called the ________ equation.

Answer 35

Bohr

Question 36

Only energy levels where n=_________ are permitted in the energy of state equation.

Answer 36

Integer

Question 37

Bohr’s equation can be used to explain atomic ___________.

Answer 37

Spectra

Question 38

If electrons are in quantized states then the difference in energy of these states can only have __________ values.

Answer 38

Certain

Question 39

When an electron is promoted to a higher energy orbital it needs to absorb a __________ amount of energy.

Answer 39

Defined

Question 40

When an electron is promoted to a higher energy orbital it’s a ____________ process.

Answer 40

Endothermic

Question 41

When excited electrons move down to lower energy levels they _________ energy as light.

Answer 41

Emit

Question 42

What is the source of the lines observed in the emission spectrum of hydrogen?

Answer 42

Electrons moving down energy levels emit light