A bound quark-antiquark pair is a ________ while a bound quark triplet is a ________.
A. beta particle; proton
B. neutron; meson
C. meson; baryon
D. baryon; meson
E. neutrino; antineutrino
C. meson; baryon
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Geologists have principally used which class of rocks for radiometric dating?
a. Sedimentary b. Igneous c. Foliated d. Metamorphic
Shield volcanoes, like those on Venus and Mars, occur ____
a. over a hot spot b. along a subduction zone c. Inside a chamber d. along plate boundaries e. within a caldera
The proton-proton chain needs high temperature because
a. of the ground state energy of the hydrogen atom. b. of the presence of helium atoms. c. the protons must overcome the Coulomb barrier. d. of the need for low density. e. the neutrinos carry more energy away than the reaction produces.
A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it.
A. 0.41 N ? m B. 0.14 N ? m C. 0.38 N ? m D. 0.27 N ? m E. 0.77 N ? m