One roentgen is defined as
a. the amount of ionizing radiation that will produce 1/3 × 10^?9 C of electric charge in 1 cm3 of air under standard conditions.
b. the amount of radiation that deposits 10?2 J of energy into 1 kg of absorbing material.
c. the amount of radiation needed for ionization of an atom.
d. the amount of radiation needed for dissociation of a molecule.
e. the amount of radiation that deposits 1 erg of energy in 1 g of air.
a
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Can the lines in the figure below be equipotential lines?
a.
No, because there are sharp corners.
b.
No, because they are isolated lines.
c.
Yes, because any lines within a charge distribution are equipotential lines.
d.
Yes, they might be boundary lines of the two surfaces of a conductor.
e.
It is not possible to say without further information.
The type of mineral formed is determined by
A) crystallization. B) the elements present and the conditions that lead to formation. C) silica content. D) chemical bonding.
A horizontal force of 12 Newtons is applied to a 4.0 kg box that slides on a horizontal surface. The box starts from rest moves a horizontal distance of 10 meters and obtains a velocity of 5.0 m/s. The surface has friction. The friction force is
A. 7.0 N. B. 6.5 N. C. 6.0 N. D. 5.7 N. E. 4.9 N.
The basic idea of the "string" hypothesis is that the fundamental particles are
A) very tiny hollow spheres. B) tiny loops of infinitely slender material. C) just geometric points (infinitely tiny points). D) made of chocolate fudge. E) infinitely long and infinitely slender objects.