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Author Question: Which of the following devices use lasers? a. DVD players b. fiber optics communication systems ... (Read 90 times)

sdfghj

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on: Jul 28, 2018
Which of the following devices use lasers?
 a. DVD players
  b. fiber optics communication systems
  c. photocopiers
  d. UPC price scanners

Question 2

In which of the following energy level transitions for a hydrogen atom is a photon emitted?
 a. n =1 to n = 2
  b. n =3 to n = 2
  c. n =2 to n = 1
  d. n =1 to n = 4
  e. n =4 to n = 3


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fatboyy09

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Reply #1 on: Jul 28, 2018
Answer to Question 1

A, B, D

Answer to Question 2

B, C, E


sdfghj

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Reply 2 on: Jul 28, 2018
Excellent

mohan

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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