In radioactive decay, the original nucleus before decay is ...

[cool]

In radioactive decay, the original nucleus before decay is referred to as the
 
  A) daughter isotope
  B) parent isotope
  C) mother-in-law isotope
  D) progenitor isotope

Question 2

Total constructive interference occurs when two waves with similar frequency and wavelength
 
  A) are completely out of phase.
  B) are completely in phase.
  C) have 45 degrees phase difference.
  D) have 90 degrees phase difference.
  E) have a phase difference of -90 degrees.

[kjo;oj]

Answer to Question 1

B

Answer to Question 2

B

[cool]

YES! Correct, THANKS for helping me on my review

[amynguyen1221]

Thanks for the timely response, appreciate it