The ELT, an electronic, battery-operated transmitter, sends forth a distinctive _______ on 121.5 MHz.

单选题

When an electron is removed from an atom, the atom is said to be ___.

答案解析

单选题

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?

答案解析

单选题

The ELT, an electronic, battery-operated transmitter, sends forth a distinctive _______ on 121.5 MHz.

答案解析

单选题

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.

答案解析