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Author Question: An electromagnetic wave with a peak magnetic field component of 3.2 10-7 T carries what average ... (Read 99 times)

PhilipSeeMore

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on: Jul 28, 2018
An electromagnetic wave with a peak magnetic field component of 3.2  10-7 T carries what average power per unit area? (m0 = 4p  10-7 Tm/A, e0 = 8.85  10-12 C2/Nm2, and c = 3.00  108 m/s)
 a. 12 W/m2
  c. 2.7 W/m2
  b. 3.0 W/m2
  d. 1.3 W/m2

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. What is the frequency of the fork when the speed of sound is taken to be 340 m/s?
 a. 340 Hz
  c. 1020 Hz
  b. 680 Hz
  d. 170 Hz


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Sammyo

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

A

Answer to Question 2

A


PhilipSeeMore

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Reply 2 on: Jul 28, 2018
Gracias!

mammy1697

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Reply 3 on: Yesterday
Wow, this really help

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