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Author Question: A radio wave transmits 4.8 W/m2 average power per unit area. What is the peak value of the ... (Read 78 times)

savannahhooper

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on: Jul 28, 2018
A radio wave transmits 4.8 W/m2 average power per unit area. What is the peak value of the associated magnetic field? (m0 = 4p  10-7 Tm/A and c = 3.00  108 m/s)
 a. 1.0  10-7 T
  c. 2.0  107 T
  b. 8.4  10-3 T
  d. 30 T

Question 2

A tuning fork is sounded above an adjustable length resonating tube (one end closed), which resonates at a length of 0.250 m and again at 0.750 m. If the tube length were extended further, at what point will the tuning fork again create a resonance condition?
 a. 1.75 m
  c. 1.25 m
  b. 1.50 m
  d. 1.00 m


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matt

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

C

Answer to Question 2

C


savannahhooper

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Reply #2 on: Jul 28, 2018
Both answers were spot on, thank you once again


matt

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Reply #3 on: Jul 28, 2018
Great! Please up vote :D


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