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What is the radius (in fm) of {image} ?. 6.4 17.2 16.4 5.3 5.7. Two isotopes of gadolinium have the same _____. neutron number nucleon number and neutron number atomic number nucleon number mass number. - PowerPoint PPT Presentation
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1. 6.42. 17.23. 16.44. 5.35. 5.7
Two isotopes of gadolinium have the same _____.
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1. neutron number2. nucleon number
and neutron number
3. atomic number4. nucleon number5. mass number
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1. 1.62. 2.03. 0.304. 1.15. 0.60
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1. 2.
3.
4. 5.
What is the ratio of protons to neutrons for large mass number nuclei which are stable?
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1. almost 2 to 12. greater than 13. unrelated to the
stability of nuclei4. less than 15. equal to 1
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1. 3.52. 15.43. 1.64. 6.85. 27.3
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3.
4. 5.
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1. 0.8892. 5.883. 94.04. 74.35. 27.2
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3.
4. 5.
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1. 2.
3.
4. 5.
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1. 2.
3.
4. 5.
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3. 4.
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1. 0.52 kg2. 2.1 kg3. 0.37 kg4. 6.6 kg5. 5.7 kg
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1. 3,2002. 16,4003. 15,3004. 6,3005. 7,700
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1. 0.392. 0.553. 0.674. 0.595. 0.41
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3.
4. 5.
Radioactive nuclei can decay spontaneously by emitting the following particles: _____.
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1. helium nuclei, electrons, photons
2. quarks and leptons3. electrons, neutrons,
protons4. helium nuclei, electrons,
protons5. electrons, neutrons,
photons
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3.
4. 5.
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1. 2.
3.
4. 5.
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4. 5.
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1. 7.262. 2.523. 2.674. 3.835. 5.27
When a neutron decays, a proton and an electron are observed. When the electrons emitted from a sample of neutrons are observed, they are found to have different kinetic energies. This was accounted for by _____.
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1. introducing a different particle, the neutrino
2. including the kinetic energies of the neutron and proton
3. taking into account the uncertainties associated with Heisenberg's Uncertainty Principle
4. introducing the effect of gravity on the particles
5. modifying the laws of conservation of momentum and energy
What is the reaction energy associated with a nuclear reaction?
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1. The total energy released as a result of the reaction.
2. The binding energy of the nucleons.
3. Energy called the threshold energy.
4. Energy equivalent to the disintegration energy.
5. The minimum energy necessary for such a reaction to occur.
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1. 4.12. 6.83. 3.54. 8.75. 7.0
It is often possible to use the atomic masses when calculating the binding energy of a nucleus. What is the reason for this?
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1. The atomic masses are the same as the nuclear masses.
2. The mass of the electron can usually be neglected when compared to the mass of the neutron.
3. The electron masses do not cancel.
4. Tables of nuclear masses are usually not available.
5. The electron masses cancel.
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1. the electron masses do not cancel
2. the electron masses cancel3. the mass of a positron cannot
be neglected when compared to the mass of a nucleus
4. a positron is an antiparticle5. none of the above
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1. 2.
3.
4.5.
Why are heavy nuclei unstable?
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1. The nuclear force dominates the repulsive force at distances less than 2 fm, but falls off rapidly at greater distances.
2. Nuclei are stable only when the number of neutrons equals the number of protons.
3. There are not enough protons present relative to the number of neutrons for the electrical force to be strong enough.
4. Nuclei are stable only when the number of protons exceeds the number of neutrons.
5. Each nucleon is a separate particle that is not acted on by the nuclear force.
Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that _____.
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1. the longer it exists the more radioactive nuclei Earth produces
2. the sun is the source of all the radioactive nuclei on Earth
3. there must have been many more radioactive nuclei on Earth when life began
4. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature
5. there must have been far fewer radioactive nuclei on Earth before life began
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3.
4. 5.
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1. isobars2. stable3. unstable4. radioactive5. isotopes
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1. unstable2. isotopes3. radioactive4. isobars5. stable
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1. electrons as well as neutrons2. equal numbers of protons and
neutrons3. equal numbers of protons but
different numbers of neutrons4. different numbers of protons
and neutrons5. different numbers of protons
but equal numbers of neutrons
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1. 2.
3.
4. 5.
Which of the effects listed below is not a major effect influencing the binding energy of the nucleus in the liquid-drop model?
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3.
4. 5.
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1. 22. 83. 824. 135. 50
In beta decays _____.
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1. a proton changes to a neutron2. a neutron changes to a proton3. a positron is present in the
nucleus before the decay4. first, second or third may occur5. only first or second may occur
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1. number of protons2. number of neutrons3. number of nucleons
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1. number of protons2. number of neutrons3. number of nucleons
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1. number of protons2. number of neutrons3. number of nucleons
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1. 2.
3.
4. 5.
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1. 2.
3.
4. 5.
1 2 3
33% 33%33%
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1.
2.
3.
1 2 3
33% 33%33%
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1.
2.
3.
Which of the following do you expect not to vary substantially among different isotopes of an element?
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1. Atomic mass number.
2. Nuclear spin magnetic moment.
3. Chemical properties.
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1.
2.
3.
Determine which decays can occur spontaneously.
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1.
2.
3.
![Image Reconstruction Improvement Using Multiscale AM -FM ...potentially significant impact o n image analysis applicat ions [1] . A general AM -FM representation model approximates](https://img.dokumen.tips/doc/110x75/5ed357f74e15b65b4670b703/image-reconstruction-improvement-using-multiscale-am-fm-potentially-significant.jpg)
