Unit Test — Unit test

Question 1

The atomic symbol represents potassium-40 (K-40), a radioactive isotope that has 19 protons and 21 neutrons. Which atomic symbol could represent an isotope that results from the decay of K-40?

Revolt · Accepted Answer

Superscript 40 subscript 18 upper A r.

Question 2

Which procedure will most increase the energy output of a nuclear reactor?

Revolt · Accepted Answer

raising the control rods out of the reactor

Question 3

Which issue poses the greatest long-term challenge in the development of new nuclear power plants?

Revolt · Accepted Answer

storage of radioactive waste

Question 4

What effect does supercritical mass have on a nuclear reaction?

Revolt · Accepted Answer

The reaction rate increases.

Question 5

What happens when the amount of fissionable material exceeds the critical mass?

Revolt · Accepted Answer

The chain reaction accelerates as more neutrons are generated with each round of reaction.

Question 6

In which isotope is the strong nuclear force not strong enough to balance electrostatic forces between protons?

Revolt · Accepted Answer

uranium-238

Question 7

A stable atom that has a large nucleus most likely contains

Revolt · Accepted Answer

more neutrons than protons.

Question 8

A student writes the following statements about the relationship between mass defect and nuclear binding energy.1. When an isotope’s protons and neutrons come together to form a nuclide, a small amount of mass is converted to energy.2. An equivalent amount of energy must be added to the nuclide to split apart its protons and neutrons.3. Statement 1 describes the isotope’s nuclear binding energy, and statement 2 describes the isotope’s mass defect.Which statement is correct?

Revolt · Accepted Answer

1 and 2 only

Unit Test — Unit test Answers

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