Ch 4 Section 1

Question 1

Visible light is a kind of

Answer 1

Electromagnetic radiation

Question 2

Together all the forms of electromagnetic radiation form the

Answer 2

Electromagnetic spectrum

Question 3

Wavelength is the distance between

Answer 3

Corresponding points on adjacent waves

Question 4

Significant feature of wave motion is its

Answer 4

Rewriting nature which can be characterized by wavelength and frequency

Question 5

Unit for wavelength

Answer 5

Distance unit (m, cm, nanometer)

Question 6

Frequency (v) is defined as the number of

Answer 6

Waves that pass a given point in a specific time usually one second

Question 7

Frequency unit

Answer 7

Waves per second (hertz)

Question 8

Frequency and wavelength are

Answer 8

Mathematically related to each other

C = wavelength times frequency

Question 9

In wavelength frequency equation c is the

Answer 9

Speed of light

Question 10

In wavelength frequency equation wavelength symbol is the

Answer 10

Wavelength of the electromagnetic wave in m

Question 11

In wavelength frequency equation v is the

Answer 11

Frequency of the electromagnetic wave in s^-1

Question 12

In wavelength frequency equation the product is a

Answer 12

Constant

Question 13

Wavelength is

Answer 13

Inversely proportional to v

Question 14

As wavelength decreases

Answer 14

Frequency increases

Question 15

The photoelectric effect refers to the

Answer 15

Emission of electrons from a metal when light shines on the metal

Question 16

Wave theory of light predicted that light of any frequency could supply enough

Answer 16

Energy to eject an electron

Question 17

A quantum of energy is the minimum quantity of

Answer 17

Energy that can be lost or gained by an atom

Question 18

Max Planck proposed the following relationship between a quantum of energy and frequency of radiation:

Answer 18

E = hv

Question 19

In equation E = hv, e is the

Answer 19

Energy in joules of a quantum of radiation

Question 20

In equation E = hv, v is the

Answer 20

Frequency in s^-1 of the radiation emitted

Question 21

In equation E = hv, and h is a fundamental

Answer 21

Physical constant known as plancks constant

Question 22

Plancks constant

Answer 22

6.626 x 10^-34 J • s

Question 23

Einstein introduced idea that electromagnetic radiation has a

Answer 23

Dual wave particle nature

Question 24

Electromagnetic radiation is a form of energy that exhibits

Answer 24

Wavelike behavior as it travels through space

Question 25

A photon is a particle of electromagnetic radiation having

Answer 25

Zero mass and carrying a quantum of energy

Question 26

The energy of a particular photon spends on the

Answer 26

Frequency of the radiation

Question 27

Ephoton =

Answer 27

Hv

Question 28

Electromagnetic radiation is absorbed by matter only in

Answer 28

While numbers of photons

Question 29

Different metals require different

Answer 29

Minimum frequencies to exhibit the photoelectric effect

Question 30

When current is passed through gas at low pressure the

Answer 30

Potential energy of the gas atoms increases

Question 31

Ground state of an atom

Answer 31

Lowest energy state of an atom

Question 32

Excited state of an atom is a state in which an atom has a

Answer 32

Higher potential energy than it has in its ground state

Question 33

When an excited atom returns to its ground state or lower energy excited state it gives off

Answer 33

Energy it gained in form of electromagnetic radiation

Question 34

When investigators passed electric current through a vacuum tube containing hydrogen gas at low pressure the observed

Answer 34

The emission of a characteristic pinkish glow

Question 35

When a narrow beam of the emitted light was shined through a prism it was

Answer 35

Separated into four specific colors of the visible spectrum

Question 36

The four bands of emitted light were part of what is known as

Answer 36

Hydrogens line emission spectrum

Question 37

Scientists had expected to observe the emission of a

Answer 37

Continuous range of frequencies of electromagnetic radiation: continuous spectrum

Question 38

New atomic theory called the

Answer 38

Quantum theory

Question 39

Whenever an excited hydrogen atom falls to its ground state or to lower energy excited state it emits a

Answer 39

Photon of radiation

Question 40

The fact that hydrogen atoms emit only specific frequencies of light indicated that

Answer 40

Energy differences between atoms' energy stars were fixed

Question 41

Niels Bohr proposed a hydrogen atom model that linked the atoms

Answer 41

Electron to photon emission

Question 42

According to the model the electron can

Answer 42

Circle the nucleus only in allowed paths (orbits)

Question 43

When the electron is in one of these orbits atom has a

Answer 43

Definite fixed energy

Question 44

The electron is in its lowest energy state when it is in the

Answer 44

Orbit closest to the nucleus

Question 45

This orbit is separated from the nucleus by a

Answer 45

Large empty space where the electron cannot exists

Question 46

The energy of the electron is higher when the electron is in orbits that are

Answer 46

Successively farther from the nucleus

Question 47

An electron can be in one orbit or another but not

Answer 47

In between

Question 48

While in a given orbit the electron is neither

Answer 48

Gaining nor losing energy

Question 49

When an electron falls to a lower energy s photon is emitted and the process is called

Answer 49

Emission

Question 50

Energy must be added to an atom in order to

Answer 50

Move an electron from a lower energy level to a higher energy level (absorption)

Question 51

Energy of each absorbed or emitted photon corresponds to a

Answer 51

Particular frequency of emitted radiation | Ephoton= hv

Question 52

Bohr's approach did not explain the spectra of atoms with

Answer 52

More than one electron

Question 53

Other kinds of electromagnetic radiation

Answer 53

X Rays Ultraviolet and infrared light Microwaves Radio waves

Question 54

All forms of electromagnetic radiation move at a constant speed though a vacuum of

Answer 54

3.00 x 10^8 meters per second

Question 55

3,00 x 10^8 m/s is also lights

Answer 55

Approximate speed through air | C

Question 56

The mystery of the photoelectric effect invoked the

Answer 56

Frequency of the light striking the metal

Question 57

Max Planck studied the emission of light by

Answer 57

Hot objects

Question 58

Planck proposed that a hot object does not emit

Answer 58

Electromagnetic energy continuously

Question 59

Planck suggested that the object emits energy in

Answer 59

Small specific packets called quanta

Question 60

The energy of this photon is equal to the difference in

Answer 60

Energy between the atoms Initial state and its final state

Question 61

Bohr calculated the allowed

Answer 61

Energy levels for the hydrogen atom

Question 62

Bohr related the possible energy level changes to the

Answer 62

Lines in the hydrogen emission line spectrum

Question 63

Bohr's theory didn't explain the chemical

Answer 63

Behavior of atoms