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

[rl]

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.

[fromAlphatoOmega22]

Answer to Question 1

Answer: C

Answer to Question 2

B

[rl]

Excellent

[sultana.d]

Thanks for the timely response, appreciate it