An intensity detector can be moved along a straight track. a source of spherical waves is...
An intensity detector can be moved along a straight track. a source of spherical waves is placed at one end of the track. When the detector is 2 m away from the source, it measures an intensity of 80 W/m2. What distance do we need to move the detector from that position to get a measurement 13 dB lower?
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An intensity detector can be moved along a straight track. a
source of spherical waves is...
One source emits spherical waves and another emits plane waves. For which source does the intensity...
One source emits spherical waves and another emits plane waves. For which source does the intensity measured by a detector of fixed size fall off more rapidly with distance? Which statements are true? 1.) The intensity of the plane source falls off more rapidly. 2.) The measured intensity for the spherical source decreases as 1/r2. 3.) The measured intensity for the plane source decreases as 1/r. 4.) The measured intensity for the plane source does not decrease. 5.)The measured intensity...
A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At...
A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 5.50 km from the source, a detector measures the intensity of the wave to be 24.0 μW/m2. What is the peak value of the magnetic field at the detector due to the wave? 4.48×10-10 T What is the average power radiated by the source? 9.12×103 W Now the detector is replaced with a perfectly absorbing sheet normal to the incident flux,...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 w (a) Find the intensity 10.7 m from the source W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experience the sound at the threshold of pain, 120 dB? Need Help? Read 11. -/2 points SerCP10 14 P023 My No A commuter train passes a passenger platform at a constant speed of 42.1 m/s. The...
Your friend is belching the alphabet. Where you are standing, a distance of 2 meters from...
Your friend is belching the alphabet. Where you are standing, a distance of 2 meters from your friend, the peak sound level of their belching is 68.2 dB. You would like to move far enough away from them that you won’t have to hear their belching. Assuming that the belch noises approximate spherical waves, how far should you stand from your friend in order for the peak intensity of the sound to be the threshold of hearing, 10^−12 W/m2?
Answer questions 12-15 12. A source and receiver, each 3 feet off the ground, are separated...
Answer questions 12-15
12. A source and receiver, each 3 feet off the ground, are separated by a distance of 20 feet. If a 7 foot tall barrier is placed at the midpoint between them, what is the Fresnel number at 1,000 Hz? a. 1.3 b. 2.7 c. 3.8 d. 4.2 e. 5.9 f. None of the above 13. A spherical wave at 1,000 Hz has a peak pressure amplitude of 0.04 Pa at a radius of 3 meters. What...
12) The diddley bow is an instrument which consists of a single-string tensioned between two points...
12) The diddley bow is an instrument which consists of a single-string tensioned between two points on a board, often using a glass bottle (see figure) for a bridge and a way to amplify the instrument's sound. The speed of sound in air is v = 343 m/s. a) What tension (in N) is required in a string with mass-per-unit-length u = 1 g/m to produce a fundamental frequency of G, or 49 Hz, if the length is L =...
question 4-7 4. Travelling Waves and Their Characteristics A rope wave travels in the positive x -direction. You are also told that the speed of the wave is 1000 cm/s, its frequency is 200 H...
question 4-7
4. Travelling Waves and Their Characteristics A rope wave travels in the positive x -direction. You are also told that the speed of the wave is 1000 cm/s, its frequency is 200 Hz, and that the wave is subject to the following initial conditions: at x 0 and t = 0: y =-1 cm, and, at x = 0 and t : ar = +20 cm/s (this is the velocity of the point on the rope at horizontal...
Name: A speeder travelling at 40 m/s along a straight road sees a police car in...
Name: A speeder travelling at 40 m/s along a straight road sees a police car in the distance. He applies the brakes and the car decelerates at a constant rate of5 m/s (3 pts) (3 pts) a) How long does it take for the car to reach 25 m/s? b) How far does the car travel during this time? 2. Study the following graph and answer the questions below 1Agraph of position vs. time TE (3 pts) (3 pts) (3...
I am completing a study guide for the next section of class because I am trying...
I am completing a study guide for the next section of class
because I am trying to get ahead. Any suggestions?
A wave whose displacement velocity is either in the same direction or opposite direction as the wave velocity describes which type of a wave? a. Transverse wave b. Mechanical wave c. Longitudinal wave d. Electromagnetic wave Which of the following are always one wavelength apart and are drawn as parallel lines? Plane waves b. Wave fronts c. Wave phase...
Item 6 In the case below, the original source material is given along with a sample...
Item 6 In the case below, the original source material is given along with a sample of student work. Determine the type of plagiarism by clicking the appropriate radio button. Original Source Material The design team held weekly meetings during the first semester of work. In addition to these meetings, the team members used emails and a listserv for communication. The team eventually created a website hosted by Google to keep track of all of the decisions made during the...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 w (a) Find the intensity 10.7 m from the source W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experience the sound at the threshold of pain, 120 dB? Need Help? Read 11. -/2 points SerCP10 14 P023 My No A commuter train passes a passenger platform at a constant speed of 42.1 m/s. The...
Answer questions 12-15
12. A source and receiver, each 3 feet off the ground, are separated by a distance of 20 feet. If a 7 foot tall barrier is placed at the midpoint between them, what is the Fresnel number at 1,000 Hz? a. 1.3 b. 2.7 c. 3.8 d. 4.2 e. 5.9 f. None of the above 13. A spherical wave at 1,000 Hz has a peak pressure amplitude of 0.04 Pa at a radius of 3 meters. What...
12) The diddley bow is an instrument which consists of a single-string tensioned between two points on a board, often using a glass bottle (see figure) for a bridge and a way to amplify the instrument's sound. The speed of sound in air is v = 343 m/s. a) What tension (in N) is required in a string with mass-per-unit-length u = 1 g/m to produce a fundamental frequency of G, or 49 Hz, if the length is L =...
question 4-7
4. Travelling Waves and Their Characteristics A rope wave travels in the positive x -direction. You are also told that the speed of the wave is 1000 cm/s, its frequency is 200 Hz, and that the wave is subject to the following initial conditions: at x 0 and t = 0: y =-1 cm, and, at x = 0 and t : ar = +20 cm/s (this is the velocity of the point on the rope at horizontal...
Name: A speeder travelling at 40 m/s along a straight road sees a police car in the distance. He applies the brakes and the car decelerates at a constant rate of5 m/s (3 pts) (3 pts) a) How long does it take for the car to reach 25 m/s? b) How far does the car travel during this time? 2. Study the following graph and answer the questions below 1Agraph of position vs. time TE (3 pts) (3 pts) (3...
I am completing a study guide for the next section of class
because I am trying to get ahead. Any suggestions?
A wave whose displacement velocity is either in the same direction or opposite direction as the wave velocity describes which type of a wave? a. Transverse wave b. Mechanical wave c. Longitudinal wave d. Electromagnetic wave Which of the following are always one wavelength apart and are drawn as parallel lines? Plane waves b. Wave fronts c. Wave phase...
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