This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: In some countries the AC frequency is 50 Hz. What is the time interval for one cycle at this ... (Read 107 times)

Awilson837

  • Hero Member
  • *****
  • Posts: 509
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.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

wilsonbho

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

B


Awilson837

  • Member
  • Posts: 509
Reply 2 on: Jul 28, 2018
Wow, this really help

Sarahjh

  • Member
  • Posts: 370
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Did you know?

Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.

Methicilli ...
Did you know?

Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

Did you know?

The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

The phosphorus cycle. Numbers are 1012 g P or fluxes as 1012 g P per year (data from Schlesinger 199 The phosphorus cycle. Numbers are 1012 g P or fluxes as 1012 g P per year (data from Schlesinger 199
Attention and memory are in demand during circle time. Attention and memory are in demand during circle time.
Life cycle of norepinephrine (NE): (1) NE is synthesized from the amino acid tyrosine; (2) NE is ... Life cycle of norepinephrine (NE): (1) NE is synthesized from the amino acid tyrosine; (2) NE is ...
Frequency distribution of phenotypes from the possible offspring in Figure 5.7. Height of the offspr Frequency distribution of phenotypes from the possible offspring in Figure 5.7. Height of the offspr
Jim Croce - Time in a bottle - 1973 Jim Croce - Time in a bottle - 1973
The eukaryotic cell cycle. The eukaryotic cell cycle.
Video: Mechanisms for chromosome movement Animation

For a complete list of videos, visit our video library