题目内容

X-rays are made up of ___.

A. electrons
B. protons
C. photons
D. Neutrons

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The term used to describe the loss of excess energy by the nucleus of radioactive atoms is called ____.

A. decay (disintegration)
B. ionization
C. scintillation
D. Activation

If a 500keV photon enters an atom that has a binding force of 50keV and removes an electron by giving it an energy of 50keV, then the new photon would have an energy of 400keV.

A. True
B. False

A measure of the absorbed dose of radiation is ____?

A. curie or becquerelb
B. rad or gray
C. rem or sievert
D. roentgen or coulomb per kilogram

"Ionization energy" is the amount of energy required to remove an electron from an isolated atom. For a hydrogen atom, composed of an orbiting electron bound to a nucleus of one proton, how much ionization energy is required to force the electron from its lowest energy level entirely out of the atom?

A. 136 eV
B. 13.6 eV
C. 1.36 Joule
D. 0.136 Joule