One Roentgen Is Defined as

Multiple Choice

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.