1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ElenaW [278]
3 years ago
6

your schools choir consisting of 10 singers gives a performance producing a sound intensity of 100 dB. At a point in the perform

ance one of the singers steps forward and sings a solo with a sound intensity of 90 dB. A how many times more intense is the full 10 person choir than the soloist alone? Show your work B. After singing for a few minutes the soloist rejoins the choir. A second choir consisting of 90 additional singers, then joins in.  Each group of 10 singers sings with the same intensity as the first 10 person choir. Now how many decibels of sound intensity are being produced? Show your work C. A few weeks later you attend a rock concert at which the band plays at 120 d. How many times more intense is the rock concert than the choir concert? Show you work
Physics
1 answer:
laila [671]3 years ago
7 0
There are two units of sound: intensity and in decibels. Decibels are not additive, you must convert it first to units of intensity (W/m²) using this formula:

dB = 10 log(I/10⁻¹²)

A.   100 dB = 10 log(I/10⁻¹²)
       Solving for I,
       I = 0.01 W/m²

      90 dB = 10 log(I/10⁻¹²)
      Solving for I,
       I = 0.001

Ratio = 0.01/0.001 = 10
<em>Thus,the choir is 10 times more intense than the soloist.</em>

B. Since there are 90 singers, there would be 9 groups of 10-person choir that produces 100 dB or 0.01 W/m². The total intensity would be

Total intensity = 0.01 W/m² (original choir) + 0.001 W/m² (soloist) + 10(0.01 W/m²) (additional 90 singers) = 0.111 W/m²
dB = 10 log(0.111/10⁻¹²) = <em>110.45 dB</em>

C. Rock concert:
    120 dB = 10 log(I/10⁻¹²)
    Solving for I,
    I = 1 W/m²

Ratio = 1/0.111 = 9
<em>Therefore, the rock concert is 9 times more intense than the choir concert.</em>


You might be interested in
an astronaut on earth notes that in her soft drink an ice cube floats with 9/10 of its volume submerged. if she were instead in
nadya68 [22]

The gravitation force is 1/6 that of earth, and the ice in the same soft drink would float with 9/10 submerged option (B) is correct.

<h3>What is gravitational force?</h3>

All mass-bearing objects are attracted by gravitational force. Because it consistently attempts to bring masses together rather than push them apart, the gravitational force is referred to as attractive.

As we know, the gravitational force is given by:

\rm F = \dfrac{Gm_1m_2}{r^2}

Where G is the gravitational constant.

m1 and m2 are masses.

r is the distance between the masses.

Weight of ice cube = weight of soft drink displaced

mg = ρVg

m = ρV

g does not affect astronauts on earth in a lunar module.

Thus, the gravitation force is 1/6 that of earth, and the ice in the same soft drink would float with 9/10 submerged option (B) is correct.

An astronaut on Earth notes that in her soft drink an ice cube floats with 9/10 of its volume submerged. If she were instead in a lunar module parked on the Moon where the gravitation force is 1/6 that of Earth, the ice in the same soft drink would float:A) with more than 9/10 submerged. B) with 9/10 submerged.C) with 6/10 submerged.D) totally submerged.

Learn more about the gravitational force here:

brainly.com/question/12528243

#SPJ1

3 0
1 year ago
What is the difference between Is it resource that is limited and one that is not limited? Give an example of each
sveticcg [70]
Limited resources: resources that take a long time to replenish
Example: coal, oil, nuclear gas

Non- limited resource: resources that are constantly being replenished
Example: soil, wind, water

5 0
3 years ago
How is energy transferred throughout the roller coaster
solmaris [256]

Answer:

On a roller coaster, energy changes from potential to kinetic and back again many times over and over the course of the ride. Kinetic energy is energy that an object has because of its motion. All moving objects possess kinetic energy, which is determined by the mass and speed of the object.

Explanation:

3 0
4 years ago
Read 2 more answers
Why is the temperature usually warmest a the equator and colder as you move towards the poles? *
Gwar [14]

Answer:

Option D, The equator gets more direct sunlight throughout the yea

Explanation:

3 0
3 years ago
Read 2 more answers
What phytophotodermatitis caused by?
Paraphin [41]

Phytophotodermatitis happens when certain plant chemicals cause the skin to become inflamed following exposure to sunlight.

3 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following methods has led to the earliest discoveries of massive planets orbiting near their parent stars a. detect
    13·1 answer
  • 1. You drop a rock off the top of a building. It takes 6,0 s. hit the ground. How tall is the building?
    15·2 answers
  • A person of mass 75 kg stands at the center of a rotating merry-go-round platform of radius 3.3 m and moment of inertia
    13·1 answer
  • A electron is released from rest in a uniform electric field oriented from left to right. What happens to the electric potential
    15·1 answer
  • The angle between the incident ray and reflected ray is 90°. Calculate the angle of incidence and the angle of reflection.​
    9·1 answer
  • A horizontal pole is attached to the side of a building. There is a pivot P at the wall and a chain is connected from the end of
    5·1 answer
  • A 3.8kw elective motor powers an inclined conveyer belt. It is designed to lift heavy boxes from the warehouse floor to loading
    12·1 answer
  • Do you thin it is possible to have the benefits of the Agricultural and Industrial revolutions without the environmental costs?
    13·1 answer
  • PLEASE HELP a current of 0.5 A flows with a resistance of 50 ohms what is the e.m.f applied NEED HELP ASAP AND BRAINLIEST​
    14·1 answer
  • This simulation has three parts: Intro, Compare, &amp; Mystery.I. Explore the Intro section of this simulation.1. Based on your
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!