Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

PASAR NA FINALS PHYCHEM 3 > Pre-Quantum > Flashcards

Pre-Quantum Flashcards

Lord panabangi

1
Q

It is also known as radiant energy.

A

electromagnetic radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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

A

periodic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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

A

Frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Why is electromagnetic radiation called radiant energy?

A

electromagnetic radiation carries energy through space.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

A

Wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

fewer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

short

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

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

A

their different wavelengths

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

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

A

electromagnetic spectrum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

gamma rays

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

radio waves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Wavelength range of Visible light

A

400 to 750 nm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The ______________ explains many aspects of the behavior of light

A

wave model of light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

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

A

(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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why is it called blackbody radiation?

A

because the objects studied
appear black before heating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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

A

blackbody radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

It is emitted when solids are heated.

A

radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The wavelength distribution of
the radiation depends on _________________.

A

temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

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

A

red<yellow<white

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

released or absorbed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What comes in discrete chunks?

A

Energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What does quantum mean?

A

fixed amount

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

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

A

single

23
Q

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

A

emit and absorb

24
Q

The quantum energy is an extremely _________ number.

A

small

25
Q

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

A

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

26
Q

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

A

energy

27
Q

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

A

photoelectric effect

28
Q

The notion of quantized energies is comparable to ______________?

A

staircase

29
Q

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

A

electrons

30
Q

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

A

TRUE

31
Q

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

A

metal surface,
tiny energy packets

32
Q

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

A

Planck constant times the frequency of the light

33
Q

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

A

transfer

34
Q

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

A

work function

35
Q

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

A

less energy

36
Q

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

A

intensity,
emission of electrons,
frequency

37
Q

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.

A

intensity (brightness)

38
Q

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

A

greater,
emitted

39
Q

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

A

kinetic energy

40
Q

_______ photons cause tissue damage.

A

X-ray

41
Q

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

A

line spectra

42
Q

Radiation composed of a single wavelength is _________________.

A

monochromatic

43
Q

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

A

spectrum

44
Q

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

A

continuous spectrum

45
Q

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.

A

continuous spectrum

46
Q

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

A

characteristic

47
Q

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

A

4

48
Q

What color is 410 nm?

A

Violet

49
Q

What color is 434 nm?

A

Blue

50
Q

What color is 656 nm?

A

Red

51
Q

What color is 486 nm?

A

Blue green

52
Q

Wavelength rage from Violet to Blue

A

400 to 500 nm

53
Q

Wavelength range from Blue green to Orange

A

500 to 600 nm

54
Q

Wavelength range from Orange to Red

A

600 to 700 nm

55
Q

Wavelength from Red to Dark Red

A

700 to 750 nm

56
Q

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

A

Absorption

PASAR NA FINALS PHYCHEM 3 (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions