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Author Question: A CD player uses a laser whose light frequency is 3.85 1014 Hz. Calculate the energy, in joules, of ... (Read 233 times)

cdr_15

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on: Jul 28, 2018
A CD player uses a laser whose light frequency is 3.85  1014 Hz. Calculate the energy, in joules, of the photons.

Question 2

Two solenoids are each made of 2 000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
 a. 1/4.
  b. 1/2.
  c. 1.
  d. 2
  e. 4.


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dudman123

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

2.55  1019 J

Answer to Question 2

c


cdr_15

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Reply #2 on: Jul 28, 2018
Thank you!


dudman123

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Reply #3 on: Jul 28, 2018
Always glad to help...


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