Question

A 1-watt amplifier has a 55% efficiency converting electrical power to sound power. You start at...

A 1-watt amplifier has a 55% efficiency converting electrical power to sound power. You start at 12 meters away from the amp and you move to 24 meters away from the amp. What is the difference in the intensities at the two locations in decibels?

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
. A nuclear power plant has an electrical power output of 1200 MW and operates with...
. A nuclear power plant has an electrical power output of 1200 MW and operates with an efficiency of 34%. If the excess energy is carried away from the plant by a river with a flow rate of 1.2 ×106 kg/s, what is the rise in the temperature of the flowing water? (1 MW = 1.0 ×106 W) a) 0.24 ˚C b) 0.46 ˚C c) 0.70 ˚C d) 24 ˚C
A local coal fired 200 megawatt electrical generating plant has a thermal efficiency of 30% and...
A local coal fired 200 megawatt electrical generating plant has a thermal efficiency of 30% and a nuclear 150 megawatt electrical generating plant has a thermal efficiency of 25%. a. Calculate the waste heat emitted by each (in megawatts) b. If the cooling water used for the nuclear plant were required to only rise in temperature by 2o C after it absorbs the waste heat, how much water per hour would be required to cool the nuclear plant (in cubic...
ONLY ANSWER IF YOU KNOW THE ANSWER TO ALL QUESTIONS !!! OTHERWISE I WILL GIVE A...
ONLY ANSWER IF YOU KNOW THE ANSWER TO ALL QUESTIONS !!! OTHERWISE I WILL GIVE A THUMBS DOWN!!! PLEASE INCLUDE UNITS WHEN ANSWERING!!! THANK YOU 1.Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at a location 27 m away from the sound source is 3.0 × 10-4 W/m2. What is the intensity at a spot that is 74 m away? 2. A loudspeaker has a circular opening with...
A model cost/benefit analysis of solar power. The main ingredients of this analysis are the power...
A model cost/benefit analysis of solar power. The main ingredients of this analysis are the power used (required) and the power delivered. For a simple model we want to use broader averages. Used: An American home has an average power use of 1.2 kW. That means that considering all of the daily variation, the difference between night and day and the seasons, etc., the average at any given second is 1.2 kJ per sec = 1.2 kW. Delivered: The home...
1) An echo bounces back from a building 1.55 s after you honk your horn. How...
1) An echo bounces back from a building 1.55 s after you honk your horn. How many feet away is the building if the air temperature is 27.1°C? 2) A student under water clicks two rocks together and makes a sound with a frequency of 604.0 Hz and a wavelength of 2.4 m. What is the speed of this underwater sound? 3) You see condensed steam expelled from a ship's whistle 6.75 s before you hear the sound. If the...
Project 1 Prepare job costing information for the following: Joseph runs an electrical contracting business and...
Project 1 Prepare job costing information for the following: Joseph runs an electrical contracting business and employs six electricians. He is only involved in supervision but on occasion will assist if needed. He charges direct labour hours at $45.00 per hour. Three of Joseph’s electricians are working on a job that involves wiring and fitting fixtures in a new house for Mr and Mrs Fleet. All materials and fixtures used have come from inventory. Each electrician spends half an hour...
B. A regional electric utility currently relies on natural gas for power generation. It has 200...
B. A regional electric utility currently relies on natural gas for power generation. It has 200 Mw of natural gas capacity that is running on an average of 30 percent efficiency. It is studying options for supplying additional power to its customers. It has all of the following options: Coal:   A 50 megawatt (Mw) coal plant with a capital cost of $50 million and operating costs of $5 million per year plus the cost of coal. The coal plant would...
1) While eating dinner at a high-end restaurant, you start to listen to two famous executives...
1) While eating dinner at a high-end restaurant, you start to listen to two famous executives talking about starting a merger. After you eat, you look at the news and see that story about the merger has not been made public quite yet. You get on the phone with your personal broker and purchase stocks in both companies, as much as you are able to afford. Then, two days later, when the merger is made public, the stock prices go...
APPALACHIAN CASE STUDY #1 William Kapp, aged 55 years, and his wife, Gloria, aged 37, have...
APPALACHIAN CASE STUDY #1 William Kapp, aged 55 years, and his wife, Gloria, aged 37, have recently moved from an isolated rural area of northern Appalachia to Denver, Colorado, because of Gloria’s failing health. Mrs. Kapp has had pulmonary tuberculosis for several years. They decided to move to New Mexico because they heard that the climate was better for Mrs. Kapp’s pulmonary condition. For an unknown reason, they stayed in Denver, where William obtained employment making machine parts. The Kapp’s...
QUESTION 1 Joyce works in a toy factory maintaining machines. Machines should inject exactly 500 grams...
QUESTION 1 Joyce works in a toy factory maintaining machines. Machines should inject exactly 500 grams of plastic into a mold to make a toy plane. Joyce wonders if these toy machines might need cleaning, but it's a lot of work taking apart the machines to do a proper job. She grabs planes from 24 different machines at random and weighs them. Her average is 495 grams. She knows there's a standard devation of 10 grams for all machines (Joyce...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT