What's a decay chain?
a. a nuclear chain reaction
b. one radioisotope decaying into another, which decays into another, and so on
c. the triggering of multiple fissions by a single neutron
d. none of the above
b
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A box is pushed across a horizontal table at constant speed. Of the forces on it, which pair do we know are equal in magnitude because of Newton’s third law?
A. Normal force on the box and the weight of the box. B. Normal force on the box and the normal force on the table by the box. C. The force of kinetic friction on the box and the force applied to the box by the one pushing it. D. None of these are interaction pairs.
A car is traveling along a highway at 65 mph. What is the linear speed of the bottom of the tires?
What will be an ideal response?
The force on a current-carrying wire in a magnetic field is the strongest when
A) the current is parallel to the field lines. B) the current is at a 30° angle with respect to the field lines. C) the current is at a 45° angle with respect to the field lines. D) the current is at a 60° angle with respect to the field lines. E) the current is perpendicular to the field lines.
The diagram above represents energy levels in a hydrogen atom. Each level is labeled with its energy (above the ground state of Level 1) in units of electron/volts (eV). The labeled transitions represent an electron moving between energy levels. Which transition represents an electron that absorbs a photon with 10.2 eV of energy?
A) A B) B C) C D) D E) E