Question 20 (4 points) Question 20 Unsaved The fallout from a nuclear explosion

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Question 20 (4 points) Question 20 Unsaved The fallout from a nuclear explosion and the waste from a nuclear reactor contain radioactive isotopes. For example, iodine-131 (a fission byproduct) is radioactive while iodine-127 (normal iodine) is not. An atom of iodine-131 differs from an atom of iodine-127 because the iodine-131 atom has more Question 20 options: a) gamma rays in its nucleus. b) electrons in its orbitals. c) neutrons in its nucleus. d) protons in its nucleus. Save Question 21 (4 points) Question 21 Unsaved What is needed for a nuclear chain reaction? Question 21 options: a) Supercritical mass b) Infinite mass c) Critical mass d) Subcritical mass Save Question 22 (4 points) Question 22 Unsaved Two different isotopes of the same element have the Question 22 options: a) same number of protons and neutrons, but different numbers of electrons. b) same number of electrons, but different numbers of protons and neutrons. c) same number of protons and electrons, but different numbers of neutrons. d) same number of neutrons, but different numbers of protons and electrons. Save Question 23 (4 points) Question 23 Unsaved The X-rays used in medical imaging travel through tissue relatively easily but are mostly absorbed by bone. This is because Question 23 options: a) only neutrons can absorb X-rays and the atoms in bone have many more neutrons than those in tissue. b) the atoms in bone generally have more tightly bound electrons than those in tissue and are thus able to absorb higher energy photons. c) solids, such as bone, are much better at absorbing X-ray photons than are liquids, such as those in tissue. d) the atoms in bone are slightly radioactive and the passing X-rays cause them to undergo fission. Since the atoms in tissue are not radioactive, they cannot undergo fission. Save Question 24 (4 points) Question 24 Unsaved A uranium-235 nucleus undergoes fission during a nuclear explosion. If you were to collect all the fragments of that original uranium-235 nucleus, you would find that their total combined mass is Question 24 options: a) about 1.0% more than that of the original uranium-235 nucleus. b) about 0.1% more than that of the original uranium-235 nucleus. c) less than that of the original uranium-235 nucleus. d) exactly the same as that of the original uranium-235 nucleus. Save Question 25 (4 points) Question 25 Unsaved A Radioactive isotope has a half-life of 10 minutes. How much of a 1 gram sample is left after 30 minutes? Question 25 options: a) one-eighth of a gram b) one-sixth of a gram c) one-half a gram d) one-third of a gram Save

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Solving first 4 question

Question 20 The fallout from a nuclear explosion and the waste from a nuclear reactor contain radioactive isotopes. For example, iodine-131 (a fission byproduct) is radioactive while iodine-127 (normal iodine) is not. An atom of iodine-131 differs from an atom of iodine-127 because the iodine-131 atom has more

a) gamma rays in its nucleus. b) electrons in its orbitals. c) neutrons in its nucleus. d) protons in its nucleus

Answer->(c)

Question 21 What is needed for a nuclear chain reaction?

a) Supercritical mass b) Infinite mass c) Critical mass d) Subcritical mass

Answer=(c)

Question 22 Two different isotopes of the same element have the

a) same number of protons and neutrons, but different numbers of electrons.

b) same number of electrons, but different numbers of protons and neutrons.

c) same number of protons and electrons, but different numbers of neutrons.

d) same number of neutrons, but different numbers of protons and electrons.

Answer=(c)

23 The X-rays used in medical imaging travel through tissue relatively easily but are mostly absorbed by bone.because

a) only neutrons can absorb X-rays and the atoms in bone have many more neutrons than those in tissue.

b) the atoms in bone generally have more tightly bound electrons than those in tissue and are thus able to absorb higher energy photons.

c) solids, such as bone, are much better at absorbing X-ray photons than are liquids, such as those in tissue.

d) the atoms in bone are slightly radioactive and the passing X-rays cause them to undergo fission. Since the atoms in tissue are not radioactive, they cannot undergo fission

Answer=(b)

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