« previous next »

Author Question: A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of ... (Read 115 times)

jwb375

  • Hero Member
  • *****
  • Posts: 540
on: Jul 29, 2018
A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of hearing is 1.0  10-12 W/m2. What is the sound intensity level 30.0 m from the source?
 
  A) 92.5 dB
  B) 81.5 dB
  C) 1.77  10-3 dB
  D) 1.77  10-3 W
  E) -27.5 dB

Question 2

When a change of magnetic field occurs in a closed loop of wire,
 
  A) a voltage is induced in the wire.
  B) current is made to flow in the loop of wire.
  C) electromagnetic induction occurs.
  D) all of the above
  E) none of the above


Meganchabluk

  • Sr. Member
  • ****
  • Posts: 301
Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

Awesome job my friend


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

jwb375

  • Hero Member
  • *****
  • Posts: 540
Reply #2 on: Jul 29, 2018
Thank you!


Meganchabluk

  • Sr. Member
  • ****
  • Posts: 301
Reply #3 on: Jul 29, 2018
Always glad to help...


« previous next »
 

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Organization of traditional source records Organization of traditional source records
Wind Power Wind Power
Earth emits radiation back out to space from all surfaces, both day and night Earth emits radiation back out to space from all surfaces, both day and night
Nuts are also a good source of dietary fibre Nuts are also a good source of dietary fibre
Power of Positivity Power of Positivity
Preventing the Spread of Coronavirus Disease 2019 Preventing the Spread of Coronavirus Disease 2019
Video: Carpal Tunnel Syndrome

For a complete list of videos, visit our video library