Question 1

Semiconductors are more effective than metals as converters of solar radiation into electricity because

Accepted Answer

A) it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid,thereby conducting electricity. 
B) the energy contained in sunlight gives the valence electrons in the semiconductor atoms the extra energy they need to "flow" throughout the solid. 
C) metals melt much too easily under direct sunlight and,as liquids,lose their ability to conduct electricity. 
D) solar radiation has sufficient energy to knock electrons completely off the metal surface,making it impossible for the electrons to "flow" from atom to atom and conduct electricity. 
A) it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid,thereby conducting electricity. 
B) the energy contained in sunlight gives the valence electrons in the semiconductor atoms the extra energy they need to "flow" throughout the solid. 
C) metals melt much too easily under direct sunlight and,as liquids,lose their ability to conduct electricity. 
D) solar radiation has sufficient energy to knock electrons completely off the metal surface,making it impossible for the electrons to "flow" from atom to atom and conduct electricity.

Question 2

If you have 200.0 g of radioisotope with a half-life of 5 days,how much isotope would remain after 15 days?

Accepted Answer

A) 12.5 g 
B) 13.3 g 
C) 25.0 g 
D) 40.0 g 
A) 12.5 g 
B) 13.3 g 
C) 25.0 g 
D) 40.0 g

Question 3

In the famous equation E = mc2,the symbols represent

Accepted Answer

A) E = Einstein,m = matter,c = speed of light. 
B) E = energy,m = mass,c = characteristic of the particle. 
C) E = Einstein,m = meters,c = conversion. 
D) E = energy,m = mass,c = speed of light. 
A) E = Einstein,m = matter,c = speed of light. 
B) E = energy,m = mass,c = characteristic of the particle. 
C) E = Einstein,m = meters,c = conversion. 
D) E = energy,m = mass,c = speed of light.

Question 4

Given this diagram,this semiconductor is

Accepted Answer

A) made of pure silicon. 
B) carrying an extra electron. 
C) missing an electron. 
D) excited by a photon.
Notice the electron environment around the doped atom. 
A) made of pure silicon. 
B) carrying an extra electron. 
C) missing an electron. 
D) excited by a photon.
Notice the electron environment around the doped atom.

Question 5

Which type of renewable energy has most commonly been adapted for use on an individual home basis?

Accepted Answer

A) Wind 
B) Photovoltaic 
C) Hydroelectric 
D) Biodiesel 
A) Wind 
B) Photovoltaic 
C) Hydroelectric 
D) Biodiesel

Question 6

Silicon has four electrons in its outer energy level,gallium has three.Adding small amounts of gallium to pure silicon

Accepted Answer

A) destroys the ability of the silicon to act as a semiconductor. 
B) provides the basis for using the silicon as a fuel cell. 
C) creates a p-type semiconductor. 
D) creates an n-type semiconductor. 
A) destroys the ability of the silicon to act as a semiconductor. 
B) provides the basis for using the silicon as a fuel cell. 
C) creates a p-type semiconductor. 
D) creates an n-type semiconductor.

Question 7

In a solar cell,semiconductors of the p-type and n-type are placed in contact with each other via a conducting wire.In order to generate an electric current,which of the following must be true?

Accepted Answer

A) An external battery must be attached 
B) Light shining on the system will cause oxidation to occur 
C) Light shining on the system must have enough energy to set electrons in motion from the n-type semiconductors to the p-type 
D) Light shining on the system must have enough energy to set electrons in motion from the p-type semiconductors to the n-type 
A) An external battery must be attached 
B) Light shining on the system will cause oxidation to occur 
C) Light shining on the system must have enough energy to set electrons in motion from the n-type semiconductors to the p-type 
D) Light shining on the system must have enough energy to set electrons in motion from the p-type semiconductors to the n-type

Question 8

Which naturally occurring radioactive particles are negatively charged?

Accepted Answer

A) Alpha particles 
B) Beta particles 
C) Gamma radiation 
D) Neutrons 
A) Alpha particles 
B) Beta particles 
C) Gamma radiation 
D) Neutrons

Question 9

Which source of renewable energy has seen the greatest growth in the last decade?

Accepted Answer

A) Wind 
B) Photovoltaic 
C) Hydroelectric 
D) Biodiesel 
A) Wind 
B) Photovoltaic 
C) Hydroelectric 
D) Biodiesel

Question 10

All zero greenhouse gas emission fuel sources are also renewable.

Accepted Answer

A) True 
 B)False

Question 11

Smokestacks at these plants release sulfur oxides and carbon dioxide into the air.

Accepted Answer

A) Coal-burning plants 
B) Nuclear plants 
C) Coal-burning and nuclear plants 
D) None of these choices are correct 
A) Coal-burning plants 
B) Nuclear plants 
C) Coal-burning and nuclear plants 
D) None of these choices are correct

Question 12

How is wind energy related to the Sun?

Accepted Answer

A) It has no relation 
B) Wind turbines need solar panels to operate correctly 
C) The heat of the Sun drives large-scale movements of air 
D) Wind turbines only operate during daylight hours 
A) It has no relation 
B) Wind turbines need solar panels to operate correctly 
C) The heat of the Sun drives large-scale movements of air 
D) Wind turbines only operate during daylight hours

Question 13

What type of radiation is given off in this nuclear reaction?

Accepted Answer

A) Alpha 
B) Beta 
C) Gamma 
D) Neutron 
A) Alpha 
B) Beta 
C) Gamma 
D) Neutron

Question 14

Which naturally occurring radioactive particles are the largest?

Accepted Answer

A) Alpha particles 
B) Beta particles 
C) Gamma radiation 
D) Neutrons 
A) Alpha particles 
B) Beta particles 
C) Gamma radiation 
D) Neutrons

Question 15

What metal is used to dope an n-type semiconductor?

Accepted Answer

A) Arsenic 
B) Cadmium 
C) Gallium 
D) Silicon 
A) Arsenic 
B) Cadmium 
C) Gallium 
D) Silicon

Question 16

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Accepted Answer

A) 15 percent 
B) 80 percent 
C) 22 percent 
D) 40 percent 
A) 15 percent 
B) 80 percent 
C) 22 percent 
D) 40 percent

Question 17

Which of these locations would be most likely to use electricity generated by hydroelectric power?

Accepted Answer

A) Kentucky 
B) Russia 
C) Venezuela 
D) Washington 
A) Kentucky 
B) Russia 
C) Venezuela 
D) Washington

Question 18

To date,solar radiation is not a practical source for the production of electricity used to power

Accepted Answer

A) electric highway signs. 
B) security lighting in parking lots. 
C) satellites in orbit around the earth. 
D) fleets of taxis. 
A) electric highway signs. 
B) security lighting in parking lots. 
C) satellites in orbit around the earth. 
D) fleets of taxis.

Question 19

What type of radiation is given off in this nuclear reaction?

Accepted Answer

A) Alpha 
B) Beta 
C) Gamma 
D) Neutron 
A) Alpha 
B) Beta 
C) Gamma 
D) Neutron

Question 20

In this photovoltaic (solar) cell,the n-type semiconductor is in the region labeled

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Semiconductors are more effective than metals as converters of solar radiation into electricity because

If you have 200.0 g of radioisotope with a half-life of 5 days,how much isotope would remain after 15 days?

In the famous equation E = mc2,the symbols represent

Given this diagram,this semiconductor is

Which type of renewable energy has most commonly been adapted for use on an individual home basis?

Silicon has four electrons in its outer energy level,gallium has three.Adding small amounts of gallium to pure silicon

In a solar cell,semiconductors of the p-type and n-type are placed in contact with each other via a conducting wire.In order to generate an electric current,which of the following must be true?

Which naturally occurring radioactive particles are negatively charged?

Which source of renewable energy has seen the greatest growth in the last decade?

All zero greenhouse gas emission fuel sources are also renewable.

Smokestacks at these plants release sulfur oxides and carbon dioxide into the air.

How is wind energy related to the Sun?

What type of radiation is given off in this nuclear reaction?

Which naturally occurring radioactive particles are the largest?

What metal is used to dope an n-type semiconductor?

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Which of these locations would be most likely to use electricity generated by hydroelectric power?

To date,solar radiation is not a practical source for the production of electricity used to power

What type of radiation is given off in this nuclear reaction?

In this photovoltaic (solar) cell,the n-type semiconductor is in the region labeled

Portable Electronics: the Periodic Table in the Palm of Your Hand

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Exam 6: Energy From Alternative Sources

Semiconductors are more effective than metals as converters of solar radiation into electricity because

If you have 200.0 g of radioisotope with a half-life of 5 days,how much isotope would remain after 15 days?

In the famous equation E = mc2,the symbols represent

Given this diagram,this semiconductor is

Which type of renewable energy has most commonly been adapted for use on an individual home basis?

Silicon has four electrons in its outer energy level,gallium has three.Adding small amounts of gallium to pure silicon

In a solar cell,semiconductors of the p-type and n-type are placed in contact with each other via a conducting wire.In order to generate an electric current,which of the following must be true?

Which naturally occurring radioactive particles are negatively charged?

Which source of renewable energy has seen the greatest growth in the last decade?

All zero greenhouse gas emission fuel sources are also renewable.

Smokestacks at these plants release sulfur oxides and carbon dioxide into the air.

How is wind energy related to the Sun?

What type of radiation is given off in this nuclear reaction?

Which naturally occurring radioactive particles are the largest?

What metal is used to dope an n-type semiconductor?

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Which of these locations would be most likely to use electricity generated by hydroelectric power?

To date,solar radiation is not a practical source for the production of electricity used to power

What type of radiation is given off in this nuclear reaction?

In this photovoltaic (solar) cell,the n-type semiconductor is in the region labeled

Portable Electronics: the Periodic Table in the Palm of Your Hand

The Air We Breathe

Radiation From the Sun

Climate Change

Energy From Combustion

Energy Storage

Water Everywhere: A Most Precious Resource

The World of Polymers and Plastics

Brewing and Chewing

Nutrition

Health Medicine

Genes and Life

Who Killed Drthompson a Forensic Mystery

Filters