Question 1

14C and 14N both contain 8 neutrons in their nuclei.

Accepted Answer

A) True 
 B)False

Question 2

Suppose Rutherford were able to somehow control the speed of the alpha particles he fired toward the gold nucleus.If he were able to double the speed of the alpha particles,the ones that are scattered backwards would get __________ times closer to the gold nucleus.

Accepted Answer

A) two 
B) three 
C) four 
A) two 
B) three 
C) four

Question 3

The word "laser" is taken from Light Amplification by Stimulated Emission of Radiation.What is meant by "stimulated"?

Accepted Answer

Atoms in excited states are de-excited b

Question 4

The shortest wavelength of a photon that can be emitted by a hydrogen atom,for which the initial state is n = 12,is closest to:

Accepted Answer

A) 92 nm 
B) 82 nm 
C) 72 nm 
D) 62 nm 
E) 52 nm 
A) 92 nm 
B) 82 nm 
C) 72 nm 
D) 62 nm 
E) 52 nm

Question 5

What is the wavelength of the light emitted by atomic Hydrogen according to Balmer's formula with m = 3 and n = 8?

Accepted Answer

A) 955 nm 
B) 389 nm 
C) 1950 nm 
D) 384 nm 
A) 955 nm 
B) 389 nm 
C) 1950 nm 
D) 384 nm

Question 6

How many 2d electron states can an atom have?

Accepted Answer

A) 0 
B) 4 
C) 6 
D) 8 
E) 10 
A) 0 
B) 4 
C) 6 
D) 8 
E) 10

Question 7

The correct ground state electron configuration of boron (Z = 5)is:

Accepted Answer

A) 1s22s22p 
B) 1s22s2p3 
C) 1s21p22s 
D) 1s22p23s 
E) 1s22p3 
A) 1s22s22p 
B) 1s22s2p3 
C) 1s21p22s 
D) 1s22p23s 
E) 1s22p3

Question 8

In spontaneous emission,the electrons all spontaneously emit photons of the same wavelength.

Accepted Answer

A) True 
 B)False

Question 9

Find the energy of the photon emitted when an electron drops from the n = 20 state to the n = 7 state in a hydrogen atom.

Accepted Answer

A) 0.244 eV 
B) 0.263 eV 
C) 0.283 eV 
D) 0.302 eV 
A) 0.244 eV 
B) 0.263 eV 
C) 0.283 eV 
D) 0.302 eV

Question 10

The electron in a hydrogen atom is infinitely distant at zero potential energy and is at an average radius of ao = 0.0529 nm when bound by 13.6 eV.A barely bound H atom may have an average radius as large as a bacterium,R = 14 μm.What is the nearest principal quantum number in this state?

Accepted Answer

A) 514 
B) 51 
C) 16 
D) 264,650 
A) 514 
B) 51 
C) 16 
D) 264,650

Question 11

An electron and a proton are both moving such that their kinetic energy is roughly 100 eV.How do the speeds of the particles compare?

Accepted Answer

A) The electron is moving about 30 times faster than the proton. 
B) The electron is moving about 1000 times faster than the proton. 
C) The electron and proton are moving about the same speed. 
D) The proton is moving about 30 times faster than the electron. 
A) The electron is moving about 30 times faster than the proton. 
B) The electron is moving about 1000 times faster than the proton. 
C) The electron and proton are moving about the same speed. 
D) The proton is moving about 30 times faster than the electron.

Question 12

Consider an atom with the electron configuration 1s22s22p63s23p6.Which of the following is an accurate statement concerning this atom?

Accepted Answer

A) The atomic number of this atom is Z = 11. 
B) This atom is in an excited state. 
C) This atom has a non-zero angular momentum. 
D) This atom is most likely to give rise to an ion with charge +2e. 
E) This atom would probably be very inert chemically. 
A) The atomic number of this atom is Z = 11. 
B) This atom is in an excited state. 
C) This atom has a non-zero angular momentum. 
D) This atom is most likely to give rise to an ion with charge +2e. 
E) This atom would probably be very inert chemically.

Question 13

When collisional excitation occurs,an electron collides with an atom and transfers all of its energy to that atom.

Accepted Answer

A) True 
 B)False

Question 14

How many 3d electron states can an atom have?

Accepted Answer

A) 0 
B) 4 
C) 6 
D) 8 
E) 10 
A) 0 
B) 4 
C) 6 
D) 8 
E) 10

Question 15

The Bohr model of the hydrogen atom was not able to explain

Accepted Answer

A) the cause of why some emission lines were brighter than other emission lines. 
B) the wavelengths of the emission lines in the ultraviolet range. 
C) the wavelengths of the emission lines in the infrared range. 
D) None of the above;the Bohr model explained all of these features. 
A) the cause of why some emission lines were brighter than other emission lines. 
B) the wavelengths of the emission lines in the ultraviolet range. 
C) the wavelengths of the emission lines in the infrared range. 
D) None of the above;the Bohr model explained all of these features.

Question 16

The longest wavelength of a photon that can be emitted by a hydrogen atom,for which the final state is n = 9,is closest to:

Accepted Answer

A) 39,000 nm 
B) 22,000 nm 
C) 7400 nm 
D) 16,000 nm 
E) 28,000 nm 
A) 39,000 nm 
B) 22,000 nm 
C) 7400 nm 
D) 16,000 nm 
E) 28,000 nm

Question 17

In atoms having more than one electron,electrons can only make transitions for which the l quantum number changes by one unit.

Accepted Answer

A) True 
 B)False

Question 18

All atoms of a given element contain exactly the same number of protons in their nucleus,but they may have different numbers of neutrons.

Accepted Answer

A) True 
 B)False

Question 19

Although the electron has an inherent spin angular momentum,this does not mean that it is actually a spinning ball of matter.

Accepted Answer

A) True 
 B)False

Question 20

In the spectrum of hydrogen the lines obtained by setting m = 1 in Balmer's formula is called the Lyman series.Calculate the wavelength of the spectral line of the 16th member of the Lyman series.

Accepted Answer

A) 91.6 nm 
B) 371 nm 
C) 102 nm 
D) 83.2 nm 
A) 91.6 nm 
B) 371 nm 
C) 102 nm 
D) 83.2 nm

Exam 29: Atoms and Molecules

14C and 14N both contain 8 neutrons in their nuclei.

Suppose Rutherford were able to somehow control the speed of the alpha particles he fired toward the gold nucleus.If he were able to double the speed of the alpha particles,the ones that are scattered backwards would get __________ times closer to the gold nucleus.

The word "laser" is taken from Light Amplification by Stimulated Emission of Radiation.What is meant by "stimulated"?

The shortest wavelength of a photon that can be emitted by a hydrogen atom,for which the initial state is n = 12,is closest to:

What is the wavelength of the light emitted by atomic Hydrogen according to Balmer's formula with m = 3 and n = 8?

How many 2d electron states can an atom have?

The correct ground state electron configuration of boron (Z = 5)is:

In spontaneous emission,the electrons all spontaneously emit photons of the same wavelength.

Find the energy of the photon emitted when an electron drops from the n = 20 state to the n = 7 state in a hydrogen atom.

The electron in a hydrogen atom is infinitely distant at zero potential energy and is at an average radius of ao = 0.0529 nm when bound by 13.6 eV.A barely bound H atom may have an average radius as large as a bacterium,R = 14 μm.What is the nearest principal quantum number in this state?

An electron and a proton are both moving such that their kinetic energy is roughly 100 eV.How do the speeds of the particles compare?

Consider an atom with the electron configuration 1s22s22p63s23p6.Which of the following is an accurate statement concerning this atom?

When collisional excitation occurs,an electron collides with an atom and transfers all of its energy to that atom.

How many 3d electron states can an atom have?

The Bohr model of the hydrogen atom was not able to explain

The longest wavelength of a photon that can be emitted by a hydrogen atom,for which the final state is n = 9,is closest to:

In atoms having more than one electron,electrons can only make transitions for which the l quantum number changes by one unit.

All atoms of a given element contain exactly the same number of protons in their nucleus,but they may have different numbers of neutrons.

Although the electron has an inherent spin angular momentum,this does not mean that it is actually a spinning ball of matter.

In the spectrum of hydrogen the lines obtained by setting m = 1 in Balmer's formula is called the Lyman series.Calculate the wavelength of the spectral line of the 16th member of the Lyman series.

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Quantum Physics

Nuclear Physics

Filters

¹⁴C and ¹⁴N both contain 8 neutrons in their nuclei.

Consider an atom with the electron configuration 1s²2s²2p⁶3s²3p⁶.Which of the following is an accurate statement concerning this atom?