AnswersChemistryThe Modern Atomic Theory

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Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect?

A
Shining light on a metal strip produces emissions.
B
Energy of electrons depends on light’s frequency, not intensity.
C
Particles that are emitted from a strip of metal are electrons.
D
Light is made up of extremely small particles.
2
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Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?

A
The modern model is not as widely accepted by scientists as Dalton’s model.
B
The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.
C
The modern model recognizes particles in the atom, whereas Dalton’s model does not.
D
The modern model does not explain emission spectra, whereas Dalton’s model does.
3

The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. Which is a correct explanation of the photoelectric effect according to the model?

A
Electrons move between levels only if they are hit by the right frequency of light.
B
Electrons need small amounts of energy to be released from an atom.
C
Electrons are emitted with more speed when brighter light strikes them.
D
Electrons need specific amounts of energy to jump levels and be emitted.
4

The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supported by this observation?

A
The energy of an electron increases with distance from the nucleus.
B
Energy is released when an electron moves to a higher energy level.
C
Smaller atoms have fewer spectral lines than larger atoms.
D
Electrons cannot exist in locations other than in specific orbits.
5

Which atomic model states that it is impossible to know the exact location of electrons around the nucleus?

A
Dalton model
B
plum pudding model
C
Bohr model
D
electron-cloud model
6

This flow chart shows the amount of energy that is emitted by each type of light. Open image in full-screen view In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect?

A
ultraviolet light
B
bright yellow light
C
bright red light
D
dim blue light
7

According to the Bohr model of an atom, what happens when an electron moves from the second energy level to the third energy level and then back to the second energy level?

A
Energy is released and then absorbed to form an absorption line.
B
Energy is released from the atom, and the outer level is weakened.
C
Energy is absorbed and then released to form an emission line.
D
Energy is absorbed and then stored in the atom.
8

Natalie observes these characteristics in the model of an atom. (i) includes positive charge (ii) contains electrons (iii) explains the photoelectric effect (iv) suggests the probable location of electrons Which model is Natalie most likely examining?

A
electron-cloud model
B
plum pudding model
C
Bohr model
D
Dalton’s model
9

Which equation was used by Albert Einstein to explain the photoelectric effect? [ cap e is equal to energy, h is equal to Planck’s constant, and v is equal to frequency.]

A
cap e is equal to h minus v
B
cap e is equal to v over h
C
cap e is equal to h v
D
cap e is equal to h over v
10

Which statement about the electron-cloud model is true?

A
It can easily be replaced by existing models.
B
It is the currently accepted atomic model.
C
It does not explain the formation of emission lines.
D
It specifies the location and momentum of an electron.

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