Pre-Quantum

Question 1

It is also known as radiant energy.

Answer 1

electromagnetic radiation

Question 2

Wave are considered _________ which means that the pattern of peaks and troughs repeats itself at regular intervals

Answer 2

periodic

Question 2

The number of complete wavelengths, or cycles, that pass a given point each second.

Answer 2

Frequency

Question 3

Why is electromagnetic radiation called radiant energy?

Answer 3

electromagnetic radiation carries energy through space.

Question 3

The distance between
two adjacent peaks (or between two adjacent troughs).

Answer 3

Wavelength

Question 4

Do all electromagnetic radiation moves at the same speed? Yes or No.

Answer 4

Yes, all electromagnetic radiation moves at the same speed, namely, the speed of light.

Question 5

If the wavelength is long, _______ cycles of the wave pass a given point per second, and so the frequency is low.

Answer 5

fewer

Question 6

Conversely, for a wave to have a high frequency, it must have a ________ wavelength.

Answer 6

short

Question 7

What causes the difference in properties of the different electromagnetic radiation?

Answer 7

their different wavelengths

Question 8

the various types of electromagnetic radiation arranged in order of increasing wavelength, a display called ________________.

Answer 8

electromagnetic spectrum

Question 9

The wavelengths of _________are comparable to the diameters of atomic nuclei.

Answer 9

gamma rays

Question 10

The wavelengths of __________ can be longer than a football field.

Answer 10

radio waves

Question 11

Wavelength range of Visible light

Answer 11

400 to 750 nm

Question 12

The ______________ explains many aspects of the behavior of light

Answer 12

wave model of light

Question 13

Enumerate the 3 observations that cannot be resolve by the wave model of light

Answer 13

(1) blackbody radiation
the emission of light from hot objects.

(2) photoelectric effect
the emission of electrons from metal surfaces on which light shines.

(3) emission spectra
the emission of light from electronically excited gas atoms.

Question 14

Why is it called blackbody radiation?

Answer 14

because the objects studied
appear black before heating

Question 15

It is the emission of light from electronically excited gas atoms.

Answer 15

blackbody radiation

Question 16

It is emitted when solids are heated.

Answer 16

radiation

Question 17

The wavelength distribution of
the radiation depends on _________________.

Answer 17

temperature

Question 18

Arrange the following according to increasing heat:
white, red, yellow

Answer 18

red<yellow<white

Question 19

He proposed that energy can be either ___________ or ___________ by atoms only in discrete “chunks” of some minimum size.

Answer 19

released or absorbed

Question 20

What comes in discrete chunks?

Answer 20

Energy

Question 21

What does quantum mean?

Answer 21

fixed amount

Question 22

He proposed that the energy, E, of a _________ quantum equals a
constant times the frequency
of the radiation: E= hv

Answer 22

single

Question 23

According to Planck’s theory, matter can ___________ energy only in whole number multiples of hv, such as hv, 2hv, 3hv, and so forth.

Answer 23

emit and absorb

Question 24

The quantum energy is an extremely _________ number.

Answer 24

small

Question 25

Why do energy changes seem continuous rather than quantized, or “jagged”?

Answer 25

Notice that the Planck constant is an extremely small number. Thus, a quantum of energy, hv, is an extremely small amount.

Question 26

_____________ can be released only in specific amounts, we say that the allowed energies are quantized—their values are restricted to certain quantities.

Answer 26

energy

Question 27

the emission of electrons from metal surfaces on which light shines.

Answer 27

photoelectric effect

Question 28

The notion of quantized energies is comparable to ______________?

Answer 28

staircase

Question 29

Light shining on a clean metal surface causes ___________ to be emitted from the surface.

Answer 29

electrons

Question 30

***TRUE OR FALSE*** A minimum frequency of light, different for different metals, is required for the emission of electrons.

Answer 30

TRUE

Question 31

Einstein assumed that the radiant energy striking the _______________ behaves like a stream of ________________.

Answer 31

metal surface, tiny energy packets

Question 32

Einstein deduced that each photon must have an energy equal to the ______________________________________.

Answer 32

Planck constant times the frequency of the light

Question 33

Under the right conditions, photons striking a metal surface can_________ their energy to electrons in the metal

Answer 33

transfer

Question 34

It is a certain amount of energy is required for the electrons to overcome the attractive forces holding them in the metal.

Answer 34

work function

Question 35

If the photons striking the metal have __________________ than the work function, the electrons do not acquire sufficient energy to escape from the metal.

Answer 35

less energy

Question 36

Increasing the ____________ of the light source doesn’t lead to ___________________ from the metal; only changing the ___________ of the incoming light has that effect.

Answer 36

intensity, emission of electrons, frequency

Question 37

The __________________ of the light is related to the number of photons striking the surface per unit time but not to the energy of each photon.

Answer 37

intensity (brightness)

Question 38

When the frequency is such that photons have energy __________ than the work function of the particular metal, electrons are ____________.

Answer 38

greater, emitted

Question 39

Any excess energy of the photon is converted into____________ of the emitted electron.

Answer 39

kinetic energy

Question 40

_______ photons cause tissue damage.

Answer 40

X-ray

Question 41

The Danish physicist Niels Bohr offered a theoretical explanation of ____________.

Answer 41

line spectra

Question 42

Radiation composed of a single wavelength is _________________.

Answer 42

monochromatic

Question 43

It is produced when radiation from a polychromatic source is separated into its component wavelengths.

Answer 43

spectrum

Question 44

This rainbow of colors, containing light of all wavelengths, is called a ____________________.

Answer 44

continuous spectrum

Question 45

It is produced when a narrow beam of white light is passed through a prism. The white light could be sunlight or light from an incandescent lamp.

Answer 45

continuous spectrum

Question 46

Different gases emit light of different ____________ colors when an electric current is passed through them.

Answer 46

characteristic

Question 47

When scientists first detected the line spectrum of hydrogen in the mid-1800s, they were fascinated by its simplicity. ***How many lines were observed?***

Answer 47

4

Question 48

What color is 410 nm?

Answer 48

Violet

Question 49

What color is 434 nm?

Answer 49

Blue

Question 50

What color is 656 nm?

Answer 50

Red

Question 51

What color is 486 nm?

Answer 51

Blue green

Question 52

Wavelength rage from Violet to Blue

Answer 52

400 to 500 nm

Question 53

Wavelength range from Blue green to Orange

Answer 53

500 to 600 nm

Question 54

Wavelength range from Orange to Red

Answer 54

600 to 700 nm

Question 55

Wavelength from Red to Dark Red

Answer 55

700 to 750 nm

Question 56

It can promote a molecule from a lower vibrational state to a higher one.

Answer 56

Absorption