Question: The noise level in an empty examination hall is 40 dB. When 100 students are writing an exam, the sounds of heavy breathing and pens

The noise level in an empty examination hall is 40 dB. When 100 students are writing an exam, the sounds of heavy breathing and pens traveling rapidly over paper cause the noise level to rise to 60 dB (not counting the occasional groans). Assuming that each student contributes an equal amount of noise power, find the noise level to the nearest decibel when 50 students have left.

Step by Step Solution

★★★★★

3.37 Rating (163 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

The noise level increase du... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

10-P-M-W-M (226).docx

120 KBs Word File

Students Have Also Explored These Related Oscillations Mechanical Waves Questions!

The noise level in a room is measured n times. The error for each measurement is independent of the others and is normally distributed with zero- mean and standard deviation e = 0.1. In terms of the...

Exam scores of 40 students in a statistics class are shown. (a) Estimate the mean and standard deviation from the sample. (b) Assuming that the data are from a normal distribution, de ne bins by...

To see whether students who nish an exam rst get the same grades as those who nish later, a professor kept track of the order in which papers were handed in. Of the rst 25 papers, 10 received a "B"...

I have attached 2 business research. Write a 700- to 1,050-word paper in which you practice identifying the critical first stage of developing any research study: State the purpose of the business...

Up, Up, and Away! Event Planning and Production in Las Vegas Cheri A. Young, University of Denver Daniel E. Nelson, The International School of Hospitality Kathleen S. Nelson, University of Nevada...

Correct answers only.. 1. Explain why it is difficult to estimate the value people place on environmental goods, the benefits they receive from cleaner air and other services of nature. 2. Why is...

Group: PERON A+ PERSON B +PERSON C 1- Introduction 2- Literature a. Definition of operation management b. Definition of operation strategy and why it is important c. Components of operations strategy...

2006EHR Assignment - Workplace Audit / Inspection Introduction (introduction & Presentation worth 5 Marks) Recommend 2 paragraphs Paragraph 1 - Provide overview of workplace; what it is, where it is,...

Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...

The financial statements of Procter & Gamble (P&G) can be accessed at the books website. Instructions Refer to P&Gs financial statements and the accompanying notes to answer the following questions....

ABC Store (ABC) was a chain store selling computers and accessories in Hong Kong. Due to the need for a major restructuring, its board of directors had made several moves including downsizing the...

12.6 An experiment was conducted on a new model of a particular make of automobile to determine the stopping distance at various speeds. The following data were recorded. Speed, v (km/hr) 35 50 65 80...

Is the following formula satisfiable? (r V y) A (x Vy) ^ (EV y) A (E V g)

Answer each part TRUE or FALSE. a. n = o(2n). b. 2n = o(n 2 ). A c. 2n = o(3 n ). A d. 1 = o(n). e. n = o(log n). f. 1 = o(1/n).

Using a Web search engine, find an article from a reputable source, published within the past six months, that reports on the risk coming from inside the organization compared to the risk coming from...

Bates Company issued $1,000,000, 10-year bonds and agreed to make annual sinking fund deposits of $78,000. The deposits are made at the end of each year into an account paying 6% annual interest....

What is a small open economy?

If the 0.65 M KOH of Exercise 43 is replaced by 0.65 M NH 3 , (a) Will E cel l be higher or lower than in the cell with 0.65 M KOH? (b) What will be the value of E cell ? Exercise 43 A concentration...

Suppose the sled in Exercise 6.30 is initially at rest at x = O. Use the work-energy theorem to find the speed of the sled at (a) x = 8.0 m and (b) x = 12.0 m. You can ignore friction between the...

A balky cow is leaving the barn as you try harder and harder to push her back in. In coordinates with the origin at the barn door, the cow walks from x = 0 to x = 6.9 m as you apply a force with...

A 6.0-kg box moving at 3.0 m/s on a horizontal, frictionless surface runs into a light spring of force constant 75 N/cm. Use the work-energy theorem to find the maximum compression of the spring.

You are the project manager for a new project, Project A . You have cost estimates of $ 5 , 0 0 0 in the first year and no costs in later years. There are no benefits in the first year. Benefit...

Beginning inventory on January 1 Purchase on January 9 Purchase on January 25 \begin{tabular}{rr} Units & Unit Cost \\ 250 & $2.30 \\ 60 & 2.50 \\ 100 & 2.64 \end{tabular} Answer is not complete....

Assignment 12B - Graded Remaining Time 130 00 31 What is the effective annual rate if the annual percentage rate is 11% compounded weekly? Enter your answer as a percentage rounded to two decimal...