Author Question: Which of the beams is due to a positively charged helium nucleus? A) a B) b C) c D) all of the ... (Read 128 times)

rl · **on:** Jul 29, 2018

Which of the beams is due to a positively charged helium nucleus?

A) a
B) b
C) c
D) all of the above
E) none of the above

Question 2

Two light sources are said to be coherent if they are

A) of the same frequency.
B) of the same frequency, and maintain a constant phase difference.
C) of the same amplitude, and maintain a constant phase difference.
D) of the same frequency and amplitude.