Physics homeworks okstate PDF

Preview

Summary

this description is about nothing...

Description

12/6/21, 5:15 PM

Chapter 11 Homework: PHYS-1014-62005

Chapter 11 Homework Due Nov 8 at 10:30am

Points 40

Questions 26

Available Nov 1 at 12pm - Nov 8 at 10:30am 7 days

Time Limit None

Instructions Answer each question, be careful to check for multiple choice, several answers, or true/false. You may work together for homework but the questions will not be the same for each student. This portion is worth 25 points. The essay question is from the book and must be written in your own words, do not copy each other. This question is worth 15 points. Keep it to about 5 sentences. For each essay question there will be more than 5 things you can point out that will each earn 3 points to the maximum 15.

This quiz was locked Nov 8 at 10:30am.

Attempt History LATEST

Attempt

Time

Score

Attempt 1

156 minutes

37 out of 40

Score for this quiz: 37 out of 40 Submitted Nov 8 at 4:09am This attempt took 156 minutes.

Question 1

1 / 1 pts

Xerox machines make use of

Correct!

the photoelectric effect

https://canvas.okstate.edu/courses/110021/quizzes/276314

1/12

12/6/21, 5:15 PM

Chapter 11 Homework: PHYS-1014-62005

Question 2

1 / 1 pts

Computer circuits are based on which material?

Correct!

silicon

Question 3

0 / 1 pts

Quantum tunneling

orrect Answer

ou Answered

is responsible for alpha radioactivity is responsible for the photoelectric effect

Question 4

https://canvas.okstate.edu/courses/110021/quizzes/276314

0 / 1 pts

2/12

12/6/21, 5:15 PM

Chapter 11 Homework: PHYS-1014-62005

Superconducting materials allow electrons to move without loss of energy because

orrect Answer

there is an energy gap

ou Answered

there are not impurities in the metal

Question 5

1 / 1 pts

Quantum computers are

Correct!

not yet very good at anything

Question 6

1 / 1 pts

The first integrated circuits were made of

https://canvas.okstate.edu/courses/110021/quizzes/276314

3/12

12/6/21, 5:15 PM

Correct!

Chapter 11 Homework: PHYS-1014-62005

silicon

Question 7

1 / 1 pts

Energy conservation is violated in quantum physics.

Correct!

False

Question 8

0 / 1 pts

Why is laser light particularly dangerous

ou Answered

it gets very hot

orrect Answer

it is very collimated and focused by a lens

Question 9

1 / 1 pts

LEDs key advantage over tungsten light bulbs is

https://canvas.okstate.edu/courses/110021/quizzes/276314

4/12

12/6/21, 5:15 PM

Correct!

Chapter 11 Homework: PHYS-1014-62005

they give off nearly no heat

Question 10

1 / 1 pts

Solar cells utilize

Correct!

the photoelectric effect

Question 11

1 / 1 pts

Laser light is (choose all correct answers)

Correct!

Correct!

collimated (single direction) monochromatic (single frequency)

https://canvas.okstate.edu/courses/110021/quizzes/276314

5/12

12/6/21, 5:15 PM

Chapter 11 Homework: PHYS-1014-62005

Question 12

1 / 1 pts

X-rays are generated by slamming electrons into tungsten or other metals with energies between

Correct!

50 - 100 keV

Question 13

1 / 1 pts

Transistors use semiconductors with different

Correct!

energy gaps

Question 14

1 / 1 pts

Lasers are useful because (choose all correct answers):

https://canvas.okstate.edu/courses/110021/quizzes/276314

6/12

12/6/21, 5:15 PM

Correct!

Correct!

Correct!

Chapter 11 Homework: PHYS-1014-62005

they can be made intense

they can be well collimated their light is single frequency

Question 15

1 / 1 pts

Nuclear fission requires

Correct!

quantum tunneling

Question 16

1 / 1 pts

A photon is

Correct!

a quanta of light

https://canvas.okstate.edu/courses/110021/quizzes/276314

7/12

12/6/21, 5:15 PM

Chapter 11 Homework: PHYS-1014-62005

Question 17

1 / 1 pts

Compact disc readers use

Correct!

lasers

Question 18

1 / 1 pts

The energy of photon depends on

Correct!

color

Question 19

1 / 1 pts

We can measure the exact position and velocity of a particle simultaneously.

https://canvas.okstate.edu/courses/110021/quizzes/276314

8/12

12/6/21, 5:15 PM

Correct!

Chapter 11 Homework: PHYS-1014-62005

False

Question 20

1 / 1 pts

An excited atom lowers its energy by emitting a photon, this photon then interacts with another atom, of the same type, in the same excited state, causing

Correct!

stimulated emission

Question 21

1 / 1 pts

Electrons orbiting an atom

Correct!

are restricted to certain energies/frequencies

https://canvas.okstate.edu/courses/110021/quizzes/276314

9/12

12/6/21, 5:15 PM

Chapter 11 Homework: PHYS-1014-62005

Question 22

1 / 1 pts

The quantum chain reaction refers to

Correct!

a laser

Question 23

1 / 1 pts

The photoelectric effect is important for all of the following except

Correct!

polarized sunglasses

Question 24

1 / 1 pts

You can protect something from a laser weapon by

https://canvas.okstate.edu/courses/110021/quizzes/276314

10/12

12/6/21, 5:15 PM

Correct!

Chapter 11 Homework: PHYS-1014-62005

using reflective material

Question 25

1 / 1 pts

A laser operates on the principle of

Correct!

photon avalanche

Question 26

15 / 15 pts

Answer essay question #5 from chapter 11 of the book. Your Answer: 5) Superconductivity sounds super, yet people do not use it in everyday life. Explain the nature of superconductivity, the physics behind it, and why it is not more widely used. Discuss its present-day applications and the possibilities for the future. The behavior of Superconductors comes from electrons being waves and that within a certain crystal it can cause an energy gap. The energy gap is 0.001 which gives it zero resistance. The flowing electrons in superconductors have a low amount of energy. within ordinary metals the https://canvas.okstate.edu/courses/110021/quizzes/276314

11/12

12/6/21, 5:15 PM

Chapter 11 Homework: PHYS-1014-62005

flowing electrons would collide with impurities a would either gain or lose energy. The electrons are moving at the same speed and in this state, there is no energy but the nuclei are in motion. Also in this state, there is an energy gap that can not gain just a little energy, but rather when there is you collide with a nucleus you have to gain at least one energy gap worth of energy or gain nothing at all. Conditions for superconductivity to happen are far-fetched . As of now, they can only occur at very low temperatures of under extremely high pressures. Present-day they are used in the medical field for MRIs and field magnets in nuclear magnetic resonance. When they are useable in higher temperatures, in the future energy transporting will be easier and computers' energy loss with become very small and could switch from AC to DC in homes. Also leviating trains and ultra-highspeed supercomputers.

Quiz Score: 37 out of 40

https://canvas.okstate.edu/courses/110021/quizzes/276314

12/12

12/6/21, 5:13 PM

Chapter 6 Homework: PHYS-1014-62005

Chapter 6 Homework Due Sep 27 at 10:30am

Points 40

Questions 26

Available Sep 20 at 12pm - Sep 27 at 10:30am 7 days

Time Limit None

Instructions Answer each question, be careful to check for multiple choice, several answers, or true/false. You may work together for homework but the questions will not be the same for each student. This portion is worth 25 points. The essay question is from the book and must be written in your own words, do not copy each other. This question is worth 15 points. Keep it to about 5 sentences. For each essay question there will be more than 5 things you can point out that will each earn 3 points to the maximum 15.

This quiz was locked Sep 27 at 10:30am.

Attempt History LATEST

Attempt

Time

Score

Attempt 1

95 minutes

20 out of 40

Score for this quiz: 20 out of 40 Submitted Sep 27 at 10:30am This attempt took 95 minutes.

Question 1

1 / 1 pts

The earth flips is magnetism, on average, approximately

https://canvas.okstate.edu/courses/110021/quizzes/276329

1/12

12/6/21, 5:13 PM

Correct!

Chapter 6 Homework: PHYS-1014-62005

twice every million years

Question 2

1 / 1 pts

The original superconductors were cooled with

Correct!

liquid helium

Question 3

0 / 1 pts

The earth's magnetism comes from

ou Answered

monopoles near (but not at) the north and south geographic poles

orrect Answer

a dynamo in its core

Question 4

https://canvas.okstate.edu/courses/110021/quizzes/276329

1 / 1 pts

2/12

12/6/21, 5:13 PM

Chapter 6 Homework: PHYS-1014-62005

Tesla wanted to use a transformer to distribute electricity because

Correct! it decreased the current going through long wires to reduce the loss of energy

Question 5

1 / 1 pts

A fuse in a house is used to prevent

Correct!

house wires from overheating

Question 6

1 / 1 pts

Rail guns push the projectile using

https://canvas.okstate.edu/courses/110021/quizzes/276329

3/12

12/6/21, 5:13 PM

Correct!

Chapter 6 Homework: PHYS-1014-62005

magnetic fields

Question 7

1 / 1 pts

In a metal, the electrons

Correct!

can move freely

Question 8

0 / 1 pts

Compass needles point north because

orrect Answer

ou Answered

there are electric currents in the iron core of the earth there are magnetic monopoles near the North Pole

https://canvas.okstate.edu/courses/110021/quizzes/276329

4/12

12/6/21, 5:13 PM

Chapter 6 Homework: PHYS-1014-62005

Question 9

0 / 1 pts

Electric force follows an inverse square law, this means

ou Answered

orrect Answer

it weakens very slowly with distance

it weakens rapidly with distance

Question 10

1 / 1 pts

A key feature of electromagnets is

Correct!

they can easily by turned on and off

Question 11

0 / 1 pts

You can levitate a magnet above a superconductor without any power applied to it

https://canvas.okstate.edu/courses/110021/quizzes/276329

5/12

12/6/21, 5:13 PM

orrect Answer

ou Answered

Chapter 6 Homework: PHYS-1014-62005

True False

Question 12

1 / 1 pts

A Tesla coil is a kind of

Correct!

transformer

Question 13

0 / 1 pts

Force between permanent magnets follows an inverse fourth law, this means

orrect Answer

ou Answered

force fall very, very rapidly with distance

force decreases slowly with distance

https://canvas.okstate.edu/courses/110021/quizzes/276329

6/12

12/6/21, 5:13 PM

Chapter 6 Homework: PHYS-1014-62005

Question 14

1 / 1 pts

In a permanent magnet, the magnetism comes from:

Correct!

the spin of the electrons

Question 15

1 / 1 pts

Static electricity occurs when two surfaces rub against each other and

Correct!

electrons flow from one to another

Question 16

1 / 1 pts

Magnetic monopoles are the magnetic equivalent of

https://canvas.okstate.edu/courses/110021/quizzes/276329

7/12

12/6/21, 5:13 PM

Correct!

Chapter 6 Homework: PHYS-1014-62005

an electric charge

Question 17

1 / 1 pts

The boxes at the top of power line poles you see in your neighborhood (used to convert high voltage AC to low voltage AC) are

Correct!

transformers

Question 18

1 / 1 pts

If you were to fall from a tree, and catch a high voltage electric power line 15 feet in the air, assuming you are less then 15 feet tall you would not be electrocuted

Correct!

True

https://canvas.okstate.edu/courses/110021/quizzes/276329

8/12

12/6/21, 5:13 PM

Chapter 6 Homework: PHYS-1014-62005

Question 19

1 / 1 pts

What invention made it possible to change low voltage AC to high voltage AC?

Correct!

transformer

Question 20

1 / 1 pts

A certain kind of generator uses its own electricity to strengthen its magnetic field. Such a generator is called a

Correct!

dynamo

Question 21

1 / 1 pts

Topsy was executed with AC

https://canvas.okstate.edu/courses/110021/quizzes/276329

9/12

12/6/21, 5:13 PM

Correct!

Chapter 6 Homework: PHYS-1014-62005

to show the dangers of AC voltage

Question 22

1 / 1 pts

Theoretically, the Earth should not have a permanent magnet in its core because

Correct!

its interior is too hot

Question 23

1 / 1 pts

At the Curie temperature

Correct!

magnetism disappears

https://canvas.okstate.edu/courses/110021/quizzes/276329

10/12

12/6/21, 5:13 PM

Chapter 6 Homework: PHYS-1014-62005

Question 24

1 / 1 pts

Electricity involves the movement of

Correct!

electrons

Question 25

1 / 1 pts

Current is measured by

Correct!

Unanswered

amps

Question 26

https://canvas.okstate.edu/courses/110021/quizzes/276329

0 / 15 pts

11/12

12/6/21, 5:13 PM

Chapter 6 Homework: PHYS-1014-62005

Answer essay question #2 from chapter 6 of the book. Your Answer:

Quiz Score: 20 out of 40

https://canvas.okstate.edu/courses/110021/quizzes/276329

12/12

12/6/21, 5:13 PM

Chapter 5 Homework: PHYS-1014-62005

Chapter 5 Homework Due Sep 20 at 10:30am

Points 40

Questions 26

Available Sep 13 at 12pm - Sep 20 at 10:30am 7 days

Time Limit None

Instructions Answer each question, be careful to check for multiple choice, several answers, or true/false. You may work together for homework but the questions will not be the same for each student. This portion is worth 25 points. The essay question is from the book and must be written in your own words, do not copy each other. This question is worth 15 points. Keep it to about 5 sentences. For each essay question there will be more than 5 things you can point out that will each earn 3 points to the maximum 15.

This quiz was locked Sep 20 at 10:30am.

Attempt History LATEST

Attempt

Time

Score

Attempt 1

838 minutes

39 out of 40

Score for this quiz: 39 out of 40 Submitted Sep 20 at 9:32am This attempt took 838 minutes.

Question 1

1 / 1 pts

The dangerous radioactivity in fallout comes from

Correct!

fission fragments

https://canvas.okstate.edu/courses/110021/quizzes/276328

1/12

12/6/21, 5:13 PM

Chapter 5 Homework: PHYS-1014-62005

Question 2

1 / 1 pts

One of the most dangerous radioactive materials from fallout is

Correct!

Sr-90

Question 3

1 / 1 pts

Plutonium is the most dangerous material known to man

Correct!

False

Question 4

1 / 1 pts

At Three Mile Island (choose all correct answers):

https://canvas.okstate.edu/courses/110021/quizzes/276328

2/12

12/6/21, 5:13 PM

Correct!

Chapter 5 Homework: PHYS-1014-62005

some of the uranium fuel melted

Question 5

1 / 1 pts

The smallest container that could contain one critical mass of plutonium is

Correct!

a coffee mug

Question 6

1 / 1 pts

The Canadian Candu reactors use

Correct!

deuterium

https://canvas.okstate.edu/courses/110021/quizzes/276328

3/12

12/6/21, 5:13 PM

Chapter 5 Homework: PHYS-1014-62005

Question 7

1 / 1 pts

PCR was used to learn about

Correct!

descendants of Sally Hemmings

Question 8

1 / 1 pts

Another name for the H-bomb is

Correct!

thermonuclear bomb

Question 9

1 / 1 pts

What is a difficulty in obtaining a nuclear bomb for a terrorist (check all correct answers):

https://canvas.okstate.edu/courses/110021/quizzes/276328

4/12

12/6/21, 5:13 PM

Correct!

Correct!