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Home Q & A Board Science-Related Homework Help Physics and Astronomy (Moderators: alblove, smith239, rubenphobia)
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Engineering
Civil, automotive, nuclear, electrical engineering etc.
Topics: 314  Posts: 976
2 months ago
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Electricity and electromagnetism
Electricity and electromagnetism
hi my question is that how do you use the right hand rule and what is the wire rule, coil rules, moter rule, d.c. generator and a.c. generator, and finally a transformer
Mathguy3000   28   1 Reply
2 days ago
Kudzu is a type of invasive
Kudzu is a type of invasive

Kudzu is a type of invasive
grashonda   39   1 Reply
A week ago
A radioisotope is place near a radiation detector, which registers 80 counts per second. Eight
A radioisotope is place near a radiation detector, which registers 80 counts per second. Eight
your help is appreciated! thank you!
Also, I am not sure how to answer this problem.
alexandria9991   37   1 Reply
A week ago
Newtons laws and motion
Newtons laws and motion
What are newtons 3 laws and can you please be more specific on the second and third law. Can you guys explain what is the relation between newtons laws and kinematics.
Mathguy3000   42   1 Reply
A week ago
Two deuterium nuclei, , fuse to produce a helium nucleus, , and a neutron. A neutral deuterium ...
Two deuterium nuclei, , fuse to produce a helium nucleus, , and a neutron. A neutral deuterium ...
Two deuterium nuclei,  , fuse to produce a helium nucleus,  , and a neutron. A neutral deuterium atom has a mass of 2.014102 u; a neutral helium atom has a mass of 3.016030 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has
Northa   58   2 Replies
2 weeks ago
When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions. One ...
When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions. One ...
When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions. One such reaction is:


Given the following mass values:   , 139.921620 u;  , 93.915367 u;   , 235.043924 u;   , 1.008
Northa   92   2 Replies
2 weeks ago
The neutral deuterium atom, , has a mass of 2.014102 u; a neutral hydrogen atom has a mass of ...
The neutral deuterium atom, , has a mass of 2.014102 u; a neutral hydrogen atom has a mass of ...
The neutral deuterium atom,  , has a mass of 2.014102 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. What is the binding energy of the   nucleus? 1 u = 931.494
Northa   53   2 Replies
2 weeks ago
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to ...
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to ...
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 μCi? 1 Ci = 3.7 × 1010 Bq.
A) 5.8 × 109 nuclei
B) 8.5 × 108 nuclei
C) 6.3 × 108 nuclei
D) 3.2 × 109
Northa   63   2 Replies
2 weeks ago
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take for a sample of ...
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take for a sample of ...
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take for a sample of americium to lose one-third of its nuclei?
A) 2960 s
B) 10.6 × 103 years
C) 4.32 × 103 years
D) 6.44 × 103 years
E) 7.84 × 103 y
Northa   82   2 Replies
2 weeks ago
An old bone sample contains 321. grams of carbon and its activity is 947. decays/min. (5730. yr half ...
An old bone sample contains 321. grams of carbon and its activity is 947. decays/min. (5730. yr half ...
An old bone sample contains 321. grams of carbon and its activity is 947. decays/min.
(5730. yr half life of Carbon-14)
(a)   How many thousand years old is the sample?
(b)   What will be the activity of the sample 2000. yrs from now?
Northa   54   2 Replies
2 weeks ago
What combination of quarks produces a neutron and what are the electric charges on these quarks, ...
What combination of quarks produces a neutron and what are the electric charges on these quarks, ...
What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?
Northa   45   2 Replies
2 weeks ago
A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron ...
A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron ...
A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron volts, between the two energy levels involved in producing this light?
A) 0.50 eV
B) 0.65 eV
C) 0.45 eV
D) 0.60 eV
E) 0.55 eV
Northa   76   2 Replies
2 weeks ago
What is the minimum energy an incoming electron must have to knock a K shell electron out of an atom ...
What is the minimum energy an incoming electron must have to knock a K shell electron out of an atom ...
What is the minimum energy an incoming electron must have to knock a K shell electron out of an atom of molybdenum (Z = 42)?
A) 10.1 × 103 eV
B) 11.3 × 103 eV
C) 22.9 × 103 eV
D) 34.4 × 103 eV
E) 44.0 × 103 eV
Northa   26   2 Replies
2 weeks ago
How many values can the magnetic quantum number have in a hydrogen atom in which the electron has ...
How many values can the magnetic quantum number have in a hydrogen atom in which the electron has ...
How many values can the magnetic quantum number have in a hydrogen atom in which the electron has the value of the orbital angular momentum quantum number equal to 8?
A) 9
B) 15
C) 5
D) 8
E) 17
Northa   25   2 Replies
2 weeks ago
What is the wavelength associated with the electron in the n = 2 state of hydrogen?A) 3.32 × 10-10 ...
What is the wavelength associated with the electron in the n = 2 state of hydrogen?A) 3.32 × 10-10 ...
What is the wavelength associated with the electron in the n = 2 state of hydrogen?
A) 3.32 × 10-10 m
B) 2.03 × 10-10 m
C) 6.66 × 10-10 m
D) 4.63 × 10-10 m
E) 8.17 × 10-10 m
Northa   20   2 Replies
2 weeks ago
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition ...
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition ...
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the ni = 2 to the nf = 1 state?
A) 205.2 nm
B) 87.5 nm
C) 91.2 nm
D) 121.5 nm
E) 402.1 nm
Northa   23   2 Replies
2 weeks ago
What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the ...
What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the ...
What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state ni = 4 jumps to the final state nf = 2?
A) 243.1 nm
B) 556.2 nm
C) 486.2 nm
D) 312.2 nm
E) 609.1 nm
Northa   20   2 Replies
2 weeks ago
What is the shortest wavelength of the Lyman series?A) 91.16 nmB) 45.60 nmC) 121.5 nmD) 204.1 nmE) ...
What is the shortest wavelength of the Lyman series?A) 91.16 nmB) 45.60 nmC) 121.5 nmD) 204.1 nmE) ...
What is the shortest wavelength of the Lyman series?
A) 91.16 nm
B) 45.60 nm
C) 121.5 nm
D) 204.1 nm
E) 365 nm
Northa   38   2 Replies
2 weeks ago
What is the longest wavelength in the Paschen series?A) 2.01 nmB) 2.01 μmC) 365 nmD) 1.88 nmE) 1.88 ...
What is the longest wavelength in the Paschen series?A) 2.01 nmB) 2.01 μmC) 365 nmD) 1.88 nmE) 1.88 ...
What is the longest wavelength in the Paschen series?
A) 2.01 nm
B) 2.01 μm
C) 365 nm
D) 1.88 nm
E) 1.88 μm
Northa   19   2 Replies
2 weeks ago
Bohr's atomic theory predicted energy levels for hydrogen of En = -(2 π2 k2 e4 m)/(hn)2. If ...
Bohr's atomic theory predicted energy levels for hydrogen of En = -(2 π2 k2 e4 m)/(hn)2. If ...
Bohr's atomic theory predicted energy levels for hydrogen of En = -(2 π2 k2 e4 m)/(hn)2. If instead we place 1 electron in "orbit" about a bare nucleus of atomic number Z, how do you expect Z to be incorporated into the  En formul
Northa   23   2 Replies
2 weeks ago
The maximum number of electron states with a principal quantum number n = 3 is 15.
The maximum number of electron states with a principal quantum number n = 3 is 15.
The maximum number of electron states with a principal quantum number n = 3 is 15.
Northa   41   2 Replies
2 weeks ago
The allowed values for the magnetic quantum number, mℓ, are from mℓ = -ℓ to +ℓ.
The allowed values for the magnetic quantum number, mℓ, are from mℓ = -ℓ to +ℓ.
The allowed values for the magnetic quantum number, mℓ, are from mℓ = -ℓ to +ℓ.
Northa   35   2 Replies
2 weeks ago
The electron was discovered in 1897 by the English physicist J. J. Thomson.
The electron was discovered in 1897 by the English physicist J. J. Thomson.
The electron was discovered in 1897 by the English physicist J. J. Thomson.
Northa   27   2 Replies
2 weeks ago
A certain photon after being scattered from a free electron at rest moves at an angle of 120° with ...
A certain photon after being scattered from a free electron at rest moves at an angle of 120° with ...
A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the energy of the scattered photon?
A) 1.05 × 10-
Northa   28   2 Replies
2 weeks ago
What is the longest wavelength of light that can cause photoelectron emission from a metal that has ...
What is the longest wavelength of light that can cause photoelectron emission from a metal that has ...
What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV?
A) 417 nm
B) 257 nm
C) 344 nm
D) 564 nm
E) 610 nm
Northa   21   2 Replies
2 weeks ago
A photon has an energy of 6.60 eV. To what wavelength does this energy correspond?A) 100 nmB) 118 ...
A photon has an energy of 6.60 eV. To what wavelength does this energy correspond?A) 100 nmB) 118 ...
A photon has an energy of 6.60 eV. To what wavelength does this energy correspond?
A) 100 nm
B) 118 nm
C) 151 nm
D) 173 nm
E) 189 nm
Northa   88   2 Replies
2 weeks ago
Which one of the following is correct for the energy of a 620 nm beam of light?A) 1.60 × 10-19 eVB) ...
Which one of the following is correct for the energy of a 620 nm beam of light?A) 1.60 × 10-19 eVB) ...
Which one of the following is correct for the energy of a 620 nm beam of light?
A) 1.60 × 10-19 eV
B) 2.10 × 10-19 J
C) 3.21 × 10-19 J
D) 1.60 × 10-18 eV
E) 3.21 × 10-18 eV
Northa   24   2 Replies
2 weeks ago
A 60-W bulb is operating at an efficiency of 6.20%. What is the number of photons per second given ...
A 60-W bulb is operating at an efficiency of 6.20%. What is the number of photons per second given ...
A 60-W bulb is operating at an efficiency of 6.20%. What is the number of photons per second given off by the bulb assuming the wavelength of light to be 580 nm?
A) 5.42 × 1018 photons/s
B) 10.8 × 1018 photons/s
C) 16.2 × 1018 photons/
Northa   69   2 Replies
2 weeks ago
An electron is trapped in a box of width 0.10 nm. What is the wavelength of the photon emitted when ...
An electron is trapped in a box of width 0.10 nm. What is the wavelength of the photon emitted when ...
An electron is trapped in a box of width 0.10 nm. What is the wavelength of the photon emitted when an electron makes a transition from the n = 3 to the n = 1 state?
Northa   24   2 Replies
2 weeks ago
If in Compton scattering of X-rays from a metal, the wavelength increases by 5% at an angle of 60°, ...
If in Compton scattering of X-rays from a metal, the wavelength increases by 5% at an angle of 60°, ...
If in Compton scattering of X-rays from a metal, the wavelength increases by 5% at an angle of 60°, what was the original wavelength before scattering?
Northa   25   2 Replies
2 weeks ago
Which one of the following is the correct expression for the Heisenberg uncertainty principle?A) ...
Which one of the following is the correct expression for the Heisenberg uncertainty principle?A) ...
Which one of the following is the correct expression for the Heisenberg uncertainty principle?
A) ΔpyΔy ≥ h/2π
B) ΔpyΔy ≤ h/2π
C) Δpy/Δy ≤ h/2π
D) Δy/Δpy ≥ h/2π
E) None of the other answers is correct.
Northa   23   2 Replies
2 weeks ago
A proton and an electron are both accelerated to the same final speed. If λp is the de Broglie ...
A proton and an electron are both accelerated to the same final speed. If λp is the de Broglie ...
A proton and an electron are both accelerated to the same final speed. If λp is the de Broglie wavelength of the proton and λe is the de Broglie wavelength of the electron, then
A) λp > λe.
B) λp = λe.
C) λp < λe.
D) Not eno
Northa   29   2 Replies
2 weeks ago
What happens to the frequency of the scattered X-rays beam as the scattering angle in the Compton ...
What happens to the frequency of the scattered X-rays beam as the scattering angle in the Compton ...
What happens to the frequency of the scattered X-rays beam as the scattering angle in the Compton effect decreases?
A) It stays the same.
B) It decreases.
C) It increases.
D) Not enough information
Northa   24   2 Replies
2 weeks ago
Which of the following is the correct equation for the momentum of a photon?A) p = (hc)/λB) p = ...
Which of the following is the correct equation for the momentum of a photon?A) p = (hc)/λB) p = ...
Which of the following is the correct equation for the momentum of a photon?
A) p = (hc)/λ
B) p = λ/c
C) p = (hc)/f
D) p = (hf)/c
E) p = (hλ)/c
Northa   51   2 Replies
2 weeks ago
If the frequency of a photon is halved, what happens to its energy?A) It is doubled.B) It is ...
If the frequency of a photon is halved, what happens to its energy?A) It is doubled.B) It is ...
If the frequency of a photon is halved, what happens to its energy?
A) It is doubled.
B) It is halved.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by one-fourth.
Northa   32   2 Replies
2 weeks ago
In the spectrum of white light which one of the following colors corresponds to the highest ...
In the spectrum of white light which one of the following colors corresponds to the highest ...
In the spectrum of white light which one of the following colors corresponds to the highest temperature?
A) Yellow
B) Violet
C) Green
D) Red
E) Orange
Northa   24   2 Replies
2 weeks ago
The minimum amount of energy necessary to eject an electron from a metal surface is referred as ...
The minimum amount of energy necessary to eject an electron from a metal surface is referred as ...
The minimum amount of energy necessary to eject an electron from a metal surface is referred as Planck's constant.
Northa   21   2 Replies
2 weeks ago
The energy of an ultraviolet photon is more than the energy of an infrared photon.
The energy of an ultraviolet photon is more than the energy of an infrared photon.
The energy of an ultraviolet photon is more than the energy of an infrared photon.
Northa   37   2 Replies
2 weeks ago
A space tow barge pushes on a spaceship with a rest mass of 15,000 kg and accelerates it from a ...
A space tow barge pushes on a spaceship with a rest mass of 15,000 kg and accelerates it from a ...
A space tow barge pushes on a spaceship with a rest mass of 15,000 kg and accelerates it from a speed of 0.600c to a speed of 0.700c. How much work does the tow barge have to do to accomplish this?
A) 1.35 × 1020 J
B) 2.03 × 1020 J
C)
Northa   22   2 Replies
2 weeks ago
Two satellites with equal rest masses are traveling toward each other in deep space. One is ...
Two satellites with equal rest masses are traveling toward each other in deep space. One is ...
Two satellites with equal rest masses are traveling toward each other in deep space. One is traveling at 0.550c and the other at 0.750c. The satellites collide and stick together. What is the speed of the combined object after the collision?
A)
Northa   23   2 Replies
2 weeks ago
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Home Q & A Board Science-Related Homework Help Physics and Astronomy (Moderators: alblove, smith239, rubenphobia)