The quantum-mechanical process by which an alpha particle makes it through the potential barrier holding it in the nucleus is called
A. leaping.
B. tunneling.
C. transmitting.
D. fissioning.
E. transporting.
B. tunneling.
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The nebular theory of the formation of the solar system successfully predicts all but one of the following. Which one does the theory not predict?
A) Planets orbit around the Sun in nearly circular orbits in a flattened disk. B) the compositional differences between the terrestrial and jovian planets C) the equal number of terrestrial and jovian planets D) asteroids, Kuiper-belt comets, and the Oort cloud E) the craters on the Moon
The first law of thermodynamics states that the increase in internal energy of a system is equal to
A. the amount of heat added to the system amount of work done on the system minus the B. the amount of heat added to the system amount of work done on the system plus the C. the amount of heat added to the system amount of work done by the system minus the D. the amount of heat added to the system amount of work done on the system minus the
The period of a pendulum is 2.0 s in a stationary inertial frame of reference. What is its period when measured by an observer moving at a speed of 0.60c with respect to the inertial frame of reference?
What will be an ideal response?
A point source emits sound waves with a power output of 100 watts. What is the sound level (in dB) at a distance of 10 m?
a. 139 b. 119 c. 129 d. 109 e. 10