« previous next »

Author Question: A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of ... (Read 125 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?

Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

The effective temperature, or black body temperature, of the Sun (5777 K) is the temperature a black The effective temperature, or black body temperature, of the Sun (5777 K) is the temperature a black
Frederick Douglass, having escaped from slavery in 1836, attracted large audiences as an antislavery Frederick Douglass, having escaped from slavery in 1836, attracted large audiences as an antislavery
Cylinder Power Balance Test Cylinder Power Balance Test
Fatty fish, such as salmon, are an excellent source of omega-3 fatty acids Fatty fish, such as salmon, are an excellent source of omega-3 fatty acids
Politics, Power and the Common Good: An Introduction to Political Science, 5/E Politics, Power and the Common Good: An Introduction to Political Science, 5/E
Finding the derivative using the power rule - Solutions Finding the derivative using the power rule - Solutions
Video: Chemical Changes

For a complete list of videos, visit our video library