Physics, 21.05.2020 22:12, krystal408
Use the formula below where L is loudness measured in decibels, I is intensity of sound, and I0 is the lowest-intensity sound that the average human ear can detect. L=10logII0 . Suppose the sound intensity of a fan must be reduced by one third. By how many decibels would the loudness be decreased? Hint: Let I1 = present intensity, I2 = reduced intensity, L1 = present loudness, and L2 = reduced loudness. A. about 1.76 dB B. about 2.24 dB C. about 0.25 dB D. about 1.35 dB
Answers: 1
Physics, 22.06.2019 18:30, raywalker3410
Adisk with a radius of r is oriented with its normal unit vector at an angle q with respect to a uniform electric field. which of the following would result in an increase in the electric flux through the disk? check all that apply? a. increasing the area of the disk b. decreasing the given orientation angle of the disk c. decreasing the strength of the electric field d. increasing the given orientation angle of the disk, but not exceeding an angle of 90
Answers: 1
Physics, 22.06.2019 18:50, rurbanok12
8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.
Answers: 3
Use the formula below where L is loudness measured in decibels, I is intensity of sound, and I0 is t...
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