Which of the following transitions within an atom is not possible?
A) An electron begins in an excited state and then gains enough energy to jump to the ground state.
B) An electron begins in the ground state and then gains enough energy to jump to an excited state.
C) An electron begins in the ground state and then gains enough energy to become ionized.
D) An electron begins in an excited state and then gains enough energy to become ionized.
A
You might also like to view...
A small airplane with a wing span of 12 m flies horizontally and due north at a speed of 60 m/s in a region where the magnetic field of the earth is 60 ?T directed 60° below the horizontal. What is the magnitude of the induced emf between the ends of the wing?
a. 50 mV b. 31 mV c. 37 mV d. 44 mV e. 22 mV
When an item has been launched into orbit:
a. it no longer falls because the weakening of Earth's gravity with increased height has made it lighter than air. b. it no longer falls because it is outside the atmosphere. c. it is kept in orbit by attraction to the Sun and Moon. d. it continues to fall but its path never reaches the ground. e. centripetal force from Earth's gravity keeps it from being accelerated toward Earth.
The international standard thermometer is kept:
A. near Washington, D.C. B. near Paris, France C. near the north pole D. near Rome, Italy E. nowhere (there is none)
The element potassium should produce compounds most similar to those of
a. Tc. b. Na. c. Al. d. Sr.