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Author Question: In some countries the AC frequency is 50 Hz. What is the time interval for one cycle at this ... (Read 106 times)

Awilson837

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on: Jul 28, 2018
In some countries the AC frequency is 50 Hz. What is the time interval for one cycle at this frequency?
 a. 0.0050 s
  c. 2 s
  b. 0.020 s
  d. 50 s

Question 2

What is the cause of refraction of a wave traveling from one medium to another?
 a. There is a frequency change due to the change in the medium
  b. There is a speed change due to the change in the medium.
  c. There is a change in wave amplitude due to the change in the medium.
  d. None of the above are associated with refraction.


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wilsonbho

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

B

Answer to Question 2

B


Awilson837

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Reply 2 on: Jul 28, 2018
:D TYSM

duy1981999

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Reply 3 on: Yesterday
Excellent

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