Author Question: For the Doppler effect to occur, there must be a. a moving source. b. a moving observer. c. ... (Read 104 times)

Ebrown · **on:** Jul 28, 2018

For the Doppler effect to occur, there must be
a. a moving source.
b. a moving observer.
c. relative motion between a source and an observer.
d. no motion.

Question 2

The energy needed to change a He+ ion in the ground state into a He2+ ion is
a. 13.6 eV
b. 54.4 eV
c. 112.4 eV
d. 92.9 eV
e. 27.2 eV