What is a neutron?

303 results

  1. Chemistry

    which process occurs in a controlled fusion reaction? 1 light nuclei collide to produce heavier nuclei. 2 heavy nuclei collide to produce lighter nuclei. 3 neutron bombardment splits light nuclei 4 neutron bombardment splits heavy nuclei. is it 1 ?

  2. physics

    A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy

  3. PHYSICS!!!

    A neutron, a proton, and an electron are initially at the same distance from a relatively large stationary nucleus moving at a constant velocity. Assume the masses of the proton and neutron are equal. 1. Which is the first particle to reach the nucleus? 2.

  5. Chemistry

    Can u show me how to calculate the neutron-to-proton ratio of an atom? For example: tin-134 or silver-107

  6. Biology

    1 Name each subatomic particle, its charge, and its location in an atom. A. proton, positive charge, nucleus; neutron, positive charge, nucleus; electron, no charge, space around nucleus B. proton, positive charge, nucleus; neutron, no charge, nucleus;

  7. Physics

    In the first step of nuclear fission, a U-235 atom absorbs a neutron and becomes U-236 before becoming unstable and breaking into two smaller atoms and emitting various energies and particles. The mass of the U-235 is 235 amu and the mass of the neutron is

  8. chemistry

    What kind of atoms typically have unstable nuclei? atoms with a neutron count greater than 90 atoms with a neutron count less than 90 atoms with a proton count less than 90 atoms with a proton count greater than 90 is it d?

  10. college physics

    In a nuclear reactor, neutrons released by nuclear fission must be slowed down before they can trigger additional reactions in other nuclei. To see what sort of material is most effective in slowing (or moderating) a neutron, calculate the ratio of a

  11. Physics

    1)An electron moved from point A to point B along an equipotential surface. a)the eclectron performs work in moving from point A to point B b)Work is required to move the electron from point A to point B c)Work is both required and performed in moving the

  12. Physical Science

    Explain why a neutral atom cannot haveone proton, one neutron and two electrons?

  13. chemistry

    if the radius of a neutron is 1.0 x 10 minus 13cm calculate the density of a neutron in g/cm 3

  15. Physics

    A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy

  16. College Chemistry (Hard)

    The easiest fusion reaction to initiate is 1-1H + 1-1H------> 4-2He + 1-0 n The 1-1 indicates a small one above the other on the left side of the symbol of the element.So for 1-0n is a one above a zero on the left side of n (neutron). The number on the top

  17. Physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is

  18. physics

    Assume that the mass of a neutron star is 1.5 times that of the Sun and the radius of the neutron star is 10 km. Ignore effects of Special Relativity. What is the approximate speed at which an object released from far away (at zero speed) reaches the

  20. Physics

    (1) A bullet of mass 1.9×10−3 kg embeds itself in a wooden block with mass 0.987 kg, which then compresses a spring (k = 120 N/m) by a distance 3.5×10−2 m before coming to rest. The coefficient of kinetic friction between the block and table is 0.42.

  21. biology

    Which of the following is formed by an atom that has gained an electron? ion covalent bond new element neutron

  22. Chemistry

    Neutron stars are composed of solid nuclear matter, primarily neutrons. Assume the radius of a neutron is approx. 1.0 x 10^-13 cm. Calculate the density of a neutron. [Hint: For a sphere V=(4/3) pi r^3. Assuming that a neutron star has the same density as

  23. chemistry

    assuming that a neutron star has the same density as a neutron, calculate the mass in kilograms of a small piece of a neutron star the size of a spherical pebble with a radius of 0.11mm

  25. Physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to move off at an angle of 45 degrees. The neutron's initial speed is 5.9×105 m/s. Determine the speeds

  26. physics

    A neutron in a reactor makes an elastic head-on collision with a nitrogen atom that is initially at rest. (The mass of the nitrogen nucleus is about 14 times that of the neutron.) (a) What fraction of the neutron's kinetic energy is transferred to the

  27. physics

    A neutron, a proton, and an electron are initially at the same distance from a relatively large stationary nucleus moving at a constant velocity. Assume the masses of the proton and neutron are equal. 1. Which is the first particle to reach the nucleus? 2.

  28. science

    Will the current flow when neutron or proton are in the place of electron.if yes , then explain how and if answer is no then describe why.

  30. Chemistry please help!

    Nuclei with higher than desired neutron-to-proton ratio tend to undergo which type of decay? alpha beta gamma positron

  31. chemistry ap!!!

    Neutron diffraction is an important technique for determining the structures of molecules. Calculate the velocity of a neutron needed to achieve a wavelength of 0.989 Å. i used the equation and got 4.37, but its not right! pleas help someone

  32. chemistry 1

    How do you write balanced equations A. Neutron emission by 88Br B. Electron absorption by 116Sb C. Positron emission by 184Hg D. Alpha emission by 229Th E. Neutron capture by 200Hg

  33. Physics

    Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 5.8 x 1028 kg and 1.5 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this

  35. physic

    Assuming uniform density, how much would 1.1 cubic centimeters of neutron star material weigh on the surface of the earth? You need the density of the neutron star to do this. weight= mass*g=density*volume*g

  36. physics -- fluid mechanics

    Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 3.4 multiplied by 1028 kg and 2.0 multiplied by 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 multiplied

  37. Physics

    Neutron stars, such as the one at the center of the Crab Nebula, have about the same mass as our sun but a much smaller diameter. If you weigh 665 on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun

  38. Chemistry

    which process occurs in a controlled fusion reaction? 1 light nuclei collide to produce heavier nuclei. 2 heavy nuclei collide to produce lighter nuclei. 3 neutron bombardment splits light nuclei 4 neutron bombardment splits heavy nuclei. is it 1 ?

  40. physics

    what is the wavelength of neutron (m=1.67x10^-27kg) travelling at 3.0x10^4 m/s?

  41. Chemistry-please help

    The relative mass of a proton is 1 and the relative mass of a neutron is 1. 1)Why do we use the term "relative mass" instead of mass? Is it because the mass of a proton is compared to the mass of a carbon-12 atom? 2) Can we say that the relative mass of an

  42. Science

    Describe a proton, neutron, and electron. Where are these particles located inside an atom?

  43. Physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle '2 = 41° from the neutron's initial direction. The neutron's initial speed is 5.6

  45. Science

    During beta-particle emission, a neutron splits into _______? a proton and an electron two protons two electrons two neutrons

  46. physics

    The volume of a neutron is about 10−45 cubic meters. Suppose you packed the number of neutrons you found for problem 4 into a cube so that the neutrons touched edge to edge. How big would the cube be? (Hint: Problem 4 states that a neutron star has a

  47. Physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is

  48. chemistry

    Assuming that a neutron star has the same density as a neutron, calculate the mass in kilograms of a small piece of a neutron star the size of a spherical pebble with a radius of 0.30mm .

  50. Physics

    In an atomic nucleus what holds the protons together: the electrons, nuclear forces or gravitation? Which force is stronger?: neutron-neutron, neutron-proton or proton-proton?

  51. General Physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle è'2 = 45° from the neutron's initial direction. The neutron's initial speed is

  52. physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to move off at an angle =45. The neutron's initial speed is 3.8×105 .

  53. Chemistry

    Neutron diffraction is used in determining the structures of molecules. (a) Calculate the de Broglie wavelength of a neutron moving at 9.00% of the speed of light. __ m (b) Calculate the velocity of a neutron with a wavelength of 65 pm (1 pm = 10-12 m).

  55. physic

    Neutron stars are extremely dense objects with a mass comparable to the mass of the sun but a radius of only several thousand meters. Consider a neutron star of mass M = 1.99e+030 kg and a radius of R = 10 km. g = 1.3279e12 m/s Assuming uniform density,

  56. Physics

    A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy

  57. chem plz help!

    the rate of a nuclear reaction can be changed by?? i know adding a catalyst to a normal reaction can but to a nuclear im not sure. increasing temp decreasing pressure adding a catalyst none I suppose it all depends upon how you define a catalyst. Perhaps

  58. Chemistry

    When the ratio of neutron-to-proton dictates that a neutron must break down it will form a helium nucleus an alpha particle a proton and an electron*** Two protons

  60. science

    Where does the neutron of heliam come from although hydrogen has no neutron?

  61. physics

    Find the threshold energy that the incident neutron must have to produce the reaction 1 n 0 + 4 He 2---> 2 H 1 + 3 H 1 For this, like the 1 n 0

  62. physics 1

    Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 5.6 x 1028 kg and 1.5 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this

  63. general physics

    Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 6.3 x 1028 kg and 1.6 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this

  65. physics 1

    Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 5.6 x 1028 kg and 1.5 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this

  66. Physics

    This is a very confusing question and I have no idea how to tackle it. - In a nuclear reactor, neutrons released by nuclear fission must be slowed down before they can trigger additional reactions in other nuclei. To see what sort of material is most

  67. CHEMISTRY

    What would be the uncertainty in velocity (miles/hr) of a neutron beam particle if the position can be measured within +/- 25 angstroms. The rest mass of a neutron = 1.67493 X 10^-27 kg or 1.008664904(14) amu. I know you have to use the heisenberg

  68. Physics

    The interatomic spacing in a crystal of table salt is 0.281 nm. This crystal is being studied in a neutron diffraction experiment, similar to the one that produced the photograph in the figure. How fast must a neutron (mass = 1.67 x 10^-27 kg) be moving to

  70. Science

    What fundamental force is the reason behind the following and why: 1. Ice ring formation around Saturn 2. Aging and sagging of the skin 3. Lightning 4. Navigation using a compass 5. A neutron transforming into a proton 6. The variety of elements as seen in

  71. Physics

    Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 8.1 x 1028 kg and 1.7 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this

  72. physics

    An extremely dense neutron star with mass equal to that of the Sun has a radius of about 10 km −about the size of Manhattan Island. These stars are thought to rotate once about their axis every 0.03 to 4 s, depending on their size and mass. Suppose that

  73. PHYSICS

    A nuclear reactor contains nuclei that fission when bombarded by slow neutrons. The fission reaction produces fast neutrons which need to be moderated (i.e. slowed down) in collisions before they can cause further fissions. In this problem we consider a

  75. physics (Newton's Law of gravitation)

    I need help with this question until the end if you can, please. Thank you. A neutron star and a black hole are 2.400e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×10^30 kg and the black hole has a mass of

  76. physics (Newton's law of gravitation)

    Can anyone please help me with this question? I am really confused. A neutron star and a black hole are 2.400e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030

  77. Chemistry

    1.a radioscope which is neutron poor and very heavy is most likely to decay by? alpha , beta, electron capture, positron emission 2. When a 235-U nucleus is struck by a thermal neutron, fission occurs often with the release of neutrons. If fission

  78. Reactor Physics

    There is an infinite non-multiplying medium with diffusion length 3 cm and diffusion coefficient 1 cm. There are 3 point sources of neutrons on the x-y plane: „h Source S1 = 108 s-1 at (x, y) = (2 cm, 0) „h Source S2 = 2*108 s-1 at (x, y) = (0, 2 cm)

  80. physics (Newton"s law of gravitation)

    Please, can someone help me with this? A neutron star and a black hole are 2.400e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030 kg. What is the magnitude of

  81. physics

    A neutron star and a black hole are 5.650e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030 kg. What is the magnitude of the gravitational attraction between

  82. Physics

    Neutron stars, such as the one at the center of the Crab Nebula, have about the same mass as our sun but a much smaller diameter. If you weigh 665N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun

  83. physics

    A neutron star and a black hole are 5.650e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030 kg.

  85. Science

    What is a neutron?

  86. physics (for bobpursley, or anyone)

    Hey bob, its Mike and Jake. We wanted to start over on a new foot with you. We got assignment worth over 300pts, so far we getting 80% of the questions right, which is pretty good. We are stuck on some questions. We will tell you the questions and tell you

  87. science

    if cerium has 1.12 electrons than how many neutron and protons does it have

  88. Physical Science

    Why was the proton and electron discovered before the neutron?

  90. Chemistry

    At what speed must a neutron travel to have a wavelength of 9.2 pm?

  91. physics

    I weigh 130 pounds, so how much would I weight on a neutron star?

  92. Chemistry

    What diff will appear in the mass no.if the no. of neutron is halved no. of electron is doubled in 8 O 16

  93. Chemistry

    what particle is emitted from the nucleus during a proton and neutron decay?

  95. chemistry

    alum 27 bombarded with neutron, gamma emitted. What is isotope?

  96. Biology

    The nucleus of an atom will NOT contain a)proton b)neutron c)electron could be multiple answers

  97. CHEM

    How does the neutron to proton ratio affect the stability of an atomic nucleus ?

  98. chemistry

    Dr Bob i know the density of a neutron is 1.00727638 but do not know how to multiply it out. This supposed to be a beginner coarse.

  100. BIOLOGY

    1) How does an ionic band different 2)What are some example of elements? name the eletrical charged of a proton, neutron and eletron?

  101. chemistry

    Which ion is absorbed by a base in water? A. H3O+ B. OH- C. Neutron D. Transition metal B

  102. chemistry

    A radioisotope has a neutron/proton ratio which is too low. Which of the following processes will not occur for such a nucleus?

  103. math

    Calculate the missing values for Protons, Neutron, and Electrons for the following element Germanium - Ge

  105. Neutron star-universal gravitational problem

    Hi, i'm having problem w/ this question...i've tried everything i know and i still don't get the right answer...here's the info they give: Consider a neutron star of mass M = 1.99e+30kg and a radius of R = 10 km. They ask 3 question...two of which i have

  106. Physics

    Why is it not advisable to use protons or electrons to bombard an atom during a chemical reaction but neutron is advised

  107. Physics

    A neutron star has 12 km radius and rotation period 1.6 s. What's the centripetal acceleration on its surface at the equator?

  108. physics

    A neutron star has 10 km radius and rotation period 1.2 s What's the centripetal acceleration on its surface at the equator?

  110. physics

    What is the quantum particle of the electric field? Answer a. The proton. b. The electron. c. The photon. d. The neutron.

  111. chem.

    I really don't understanf how jameschadwick discovered the neutron. iread websites and read the 18 pg. article but what was his experiment?

  112. Science

    During beta-particle emission, a neutron splits into a proton and an electron two protons two electrons two neutrons

  113. physics

    Calculate the magnitude of the electrostatic force the two down quarks inside a neutron exert on each other if they are separated by a distance of 0.71 fm.

  115. Biology

    If the number of ___ in an atom is changed, an ion will be produced. a)proton b)neutron c)electron Could be multiple answers

  116. physics

    Explain how you can tell the following statement is false A neutron was moving in a circle while speeding up. As a result, gamma rays were emitted.

  117. physics

    Explain how you can tell the following statement is false A neutron was moving in a circle while speeding up. As a result, gamma rays were emitted.

  118. Physics

    Which of the following is an example of a baryon? a. meson b. electron c. lepton d. proton and neutron I saw a sight online that said A but on the notes my teacher had us copy it says D. It is d.

  120. Biology

    The chemical reactivity of an atom is determined by the number of ___ present. a) proton b) neutron c) electron could be multiple answers.

  121. Biology

    if the number of ____ in an atom is changed, it is no longer the same element. a)proton b)neutron c)electron I'm thinking it's A, what do you think? It could be multiple answers, too.

  122. physics

    what is curie temperature?what is a fermi energy level?what is its position in case of an intrinsic semi conductor?what is a thermal neutron?what is its importance?

  123. Chemistry

    A beam of neutrons (mneutron = 1.6749 x 10^-24 g) has a velocity of 1.44 km/hour. What is the wavelength of the neutron wave? The answer is 993 nm. I tried to use 1/2mv^2=hc/lambda but I got 1483.5 m

  125. Physics Someone help please!

    An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same

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