« previous next »

Author Question: A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of ... (Read 113 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?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Did you know?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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.

Did you know?

Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Meta-analysis of 18 studies shows that aerobic exercise causes better performance in older adults on Meta-analysis of 18 studies shows that aerobic exercise causes better performance in older adults on
Telomere length is related to the amount of time adults spend in leisure time activity. Source: Ada Telomere length is related to the amount of time adults spend in leisure time activity. Source: Ada
When the United States gets stuck over a controversial issue—usually something a divided Congress ca When the United States gets stuck over a controversial issue—usually something a divided Congress ca
The concept of a threshold stimulus. The concept of a threshold stimulus.
A “reduced power” warning light indicates a fault with the electronic throttle control system on ... A “reduced power” warning light indicates a fault with the electronic throttle control system on ...
Threshold Levels of Carbon Monoxide Threshold Levels of Carbon Monoxide
Video: Mycobacterium tuberculosis: Drug Resistance and Natural Selection

For a complete list of videos, visit our video library