The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109 yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is

A) 8.1 × 10-10 yr. B) 2.4 × 109 yr. C) 2.8 × 109 yr. D) 4.6 × 109 yr. E) 6.8 × 109 yr A) 8.1 × 10-10 yr. B) 2.4 × 109 yr. C) 2.8 × 109 yr. D) 4.6 × 109 yr. E) 6.8 × 109 yr

Exam 20: Nuclear Chemistry

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The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon.If present-day plant life has 16 dpm per gram of carbon,how old is the Indian corn? (t_1/2 = 5730 yr)

(Multiple Choice)

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Question 41

If a captured electron combines with a proton in the nucleus to form a neutron,what happens to the atomic number and the mass number?

(Essay)

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Question 42

A beta particle is a proton.

(True/False)

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Question 43

In passing through matter,alpha particles lose energy chiefly by causing

(Multiple Choice)

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Question 44

A radioisotope decays,producing an alpha particle and Th-234.The original radioisotope must have been an atom of ____.

(Multiple Choice)

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Question 45

A self-sustaining sequence of nuclear fission reactions is called a _______ _ _____.

(Short Answer)

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Question 46

In the following reaction,identify X.

(Multiple Choice)

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Question 47

In the equation below,what particle or type of radiation needs to be included to balance the equation? ²⁰⁸Pb → ? + ²⁰⁴Hg

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Question 48

Which of the following is used to test the activity of the thyroid?

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Question 49

The only stable isotope of aluminum is aluminum-27.What type of radioactive decay should be expected from ?

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Question 50

Electron capture is the capture of an electron-usually a 1s electron-by the _________________.

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Question 51

Which of the following is used to image the brain?

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Question 52

Polonium-208 is an alpha emitter with a half-life of 2.90 years.How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years?

(Multiple Choice)

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Question 53

A _ ___ uses electric and magnetic fields to increase the kinetic energy of charged species so that a reaction will occur.

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Question 54

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

(Multiple Choice)

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Question 55

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were preserved for the next 3900 years,what ¹⁴C decay rate should be expected from the wood used to make the chair? (t_1/2 = 5730 yr)

(Multiple Choice)

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Question 56

What material is ionized by radiation in a Geiger counter?

(Multiple Choice)

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Question 57

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 10⁹ yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is

(Multiple Choice)

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Question 58

The energy released by the sun is the result of

(Multiple Choice)

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Question 59

What causes the radiation damage to matter when gamma rays damages it?

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Question 60

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Exam 20: Nuclear Chemistry

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon.If present-day plant life has 16 dpm per gram of carbon,how old is the Indian corn? (t1/2 = 5730 yr)

If a captured electron combines with a proton in the nucleus to form a neutron,what happens to the atomic number and the mass number?

A beta particle is a proton.

In passing through matter,alpha particles lose energy chiefly by causing

A radioisotope decays,producing an alpha particle and Th-234.The original radioisotope must have been an atom of ____.

A self-sustaining sequence of nuclear fission reactions is called a ___________ _________ _________.

In the following reaction,identify X.

In the equation below,what particle or type of radiation needs to be included to balance the equation? 208Pb → ? + 204Hg

Which of the following is used to test the activity of the thyroid?

The only stable isotope of aluminum is aluminum-27.What type of radioactive decay should be expected from ?

Electron capture is the capture of an electron-usually a 1s electron-by the _________________.

Which of the following is used to image the brain?

Polonium-208 is an alpha emitter with a half-life of 2.90 years.How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years?

A ___________ _____________ uses electric and magnetic fields to increase the kinetic energy of charged species so that a reaction will occur.

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were preserved for the next 3900 years,what 14C decay rate should be expected from the wood used to make the chair? (t1/2 = 5730 yr)

What material is ionized by radiation in a Geiger counter?

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109 yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is

The energy released by the sun is the result of

What causes the radiation damage to matter when gamma rays damages it?

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The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon.If present-day plant life has 16 dpm per gram of carbon,how old is the Indian corn? (t_1/2 = 5730 yr)

A self-sustaining sequence of nuclear fission reactions is called a _______ _ _____.

In the equation below,what particle or type of radiation needs to be included to balance the equation? ²⁰⁸Pb → ? + ²⁰⁴Hg

A _ ___ uses electric and magnetic fields to increase the kinetic energy of charged species so that a reaction will occur.

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were preserved for the next 3900 years,what ¹⁴C decay rate should be expected from the wood used to make the chair? (t_1/2 = 5730 yr)

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 10⁹ yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is