1. A 50-cd point light source is 3.0 inches above the desk. What is the surface lighting on the desk? 2. Consider the situation where an employee spent time in a number of different areas of the plant where he was exposed to a variety of noise levels as shown in the following. Determine his noise dose. Us ehwole number and answer completely. EXPOSURE NOISE LEVEL (dBA) 0.5 100 1 95 2 90 4.5 80

1. A 50-cd point light source is 3.0 inches above the desk. What is the surface lighting on the desk? 2. Consider the situation where an employee spent time in a number of different areas of the plant where he was exposed to a variety of noise levels as shown in the following. Determine his noise dose. Us ehwole number and answer completely. EXPOSURE NOISE LEVEL (dBA) 0.5 100 1 95 2 90 4.5 80

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 43P: (a) Seismographs measure the arrival times of earthquakes with a precision of 0.100 s. To get the...

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A quality assurance engineer at a frying pan company is asked to qualify a new line of nonstick-coated frying pans. The coating needs to be 1.00 mm thick. One method to test the thickness is for the engineer to pick a percentage of the pans manufactured, strip off the coating, and measure the thickness using a micrometer. This method is a destructive testing method. Instead, the engineer decides that every frying pan will be tested using a nondestructive method. An ultrasonic transducer is used that produces sound waves with a frequency of f=25 kHz. The sound waves are sent through the coating and are reflected by the interface between the coating and the metal pan, and the time is recorded. The wavelength of the ultrasonic waves in the coating is 0.076 m. What should be the time recorded if the coating is the correct thickness (1.00 mm)?
The auditory canal of the human ear extends about 2.5 cm from the outer ear to the eardrum.a) Explain why the human ear is especially sensitive to sounds with frequencies close to 3500 Hz. Use v = 344m / s. b) Would you expect the ear to be especially sensitive to frequencies near 7000 Hz?At 10,500 Hz? Why?
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An FM station has a 1000-ft tower. How farcan its signal reach if the listeners haveantennas on the receiver that may be at groundlevel? How much additional distance is gainedif an FM receiver is placed on the roof, 30-ftoff the ground? No hand written.
The following sound exposure levels for four aircraft flyovers were measured in a 1-h period: 83.0, 88.1, 89.2, and 96.6 dB. Compute for hourly average sound level.
you do hot have a thermometer to measure temp you are able to measures the speed of sound through the air. if you measure the sound to be 349m/s. what is the air temp? V=331.4m/s + (0.606m/s/1°C)T apply this formula and answer with the exact value
(II) You are trying to decide between two new stereoamplifiers. One is rated at 75 W per channel and the otheris rated at 120 W per channel. In terms of dB, how muchlouder will the more powerful amplifier be when both areproducing sound at their maximum levels?
A: What is v at t = 18.5 ms? B: What is vR at t = 18.5 ms? C: What is vL at t = 18.5 ms? D: What is vC at t = 18.5 ms? F: What is VR? G: What is VC? H: What is VL?
Assume a 150 W loudspeaker broadcasts sound equally in all directions and produces sound with a level of 103 dB at a distance of 1.60 m from its center. (a) Find its sound power output. If a salesperson claims the speaker is rated at 150. W, he is referring to the maximum electrical power input to the speaker. (b) Find the efficiency of the speaker, that is, the fraction of input power that is converted into useful output power.
(a) Seismographs measure the arrival times of earthquakes with a precision of 0.100 s. To get the distance to the epicenter of the quake, geologists compare the arrival times of S- and P-waves, which travel at different speeds. If S- and P-waves travel at 4.00 and 7.20 km/s, respectively, in the region considered, how precisely can the distance to the source of the earthquake be determined? (b) Seismic waves from underground detonations of nuclear bombs can be used to locate the test site and detect violations of test bans. Discuss whether your answer to (a) implies a serious limit to such detection. (Note also that the uncertainty is greater if there is an uncertainty in the propagation speeds of the S- and P-waves.)
In Example 18.1, we investigated an oscillator at 1.3kHz driving two identical side-by-side speakers. We found that a listener at point O hears sound with maximum intensity, whereas a listener at point P hears a minimum. What is the intensity at P? (a) less than hut dose to the intensity at O (b) half the intensity at O (c) very low but not zero (d) zero (e) indeterminate
1. A lamp gives an average output of 628 lumens. What is the MSCP? 2. The illumination on a certain object 2.5 m from the light source is 6,648 lux, using same light source, what is the illumination on the object at 5 m? 3. 100 foot-candle at 10 ft distance from point “P”. what is the intensity? 4. A road is illuminated by two 500 cd lamps placed 6.1 m above the centerline of the road and 18.3 m apart. Solve for the illumination produced on the surface of the road at a point on the centerline midway between the lamps.