« previous next »

Author Question: A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of ... (Read 130 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?

Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

Did you know?

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

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Did you know?

Women are 50% to 75% more likely than men to experience an adverse drug reaction.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

A Model of a Pulsating X-Ray Source A Model of a Pulsating X-Ray Source
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
The physician uses percussion—tapping—to detect sound or vibration. The physician uses percussion—tapping—to detect sound or vibration.
The patient is placed between the X-ray tube, which emits a cone-shaped X-ray beam, and the film or ... The patient is placed between the X-ray tube, which emits a cone-shaped X-ray beam, and the film or ...
To maintain global power requires the continuous development of weapons. Shown here is the Osprey. ... To maintain global power requires the continuous development of weapons. Shown here is the Osprey. ...
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 ...
Video: Chemical Synapse Animation

For a complete list of videos, visit our video library