In audio and communications systems, the gain, B, in deci- bels is defined for an amplifier as Pout B = 10log Pin where Pin is the power input to the system and Pout is the power output. (a) A particular amplifier puts out 135 W of power for an input of 1.0 mW. What is its gain in dB? (b) If a signal-to-noise ratio of 93 dB is specified, what is the noise power if the output signal is 10 W?

In audio and communications systems, the gain, B, in deci- bels is defined for an amplifier as Pout B = 10log Pin where Pin is the power input to the system and Pout is the power output. (a) A particular amplifier puts out 135 W of power for an input of 1.0 mW. What is its gain in dB? (b) If a signal-to-noise ratio of 93 dB is specified, what is the noise power if the output signal is 10 W?

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter17: Sound

Section: Chapter Questions

Problem 68P: The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor...

See similar textbooks

Similar questions

The factor of 10-12 in the range of intensities to which the ear can respond, from threshold to that causing damage after brief exposure, is truly remarkable. If you could measure distances over the same range with a single instrument and the smallest distance you could measure was 1 mm, what would the largest be?
Check Your Understanding The wave function above is derived using a sine function. Can a cosine function be used instead?
What is the difference between propagation speed and the frequency of a mechanical wave? Does one or both affect wavelength? If so, how?
When poked by a spear, an operatic soprano lets out a 1200-Hz shriek. What is its wavelength if the speed of sound is 345 m/s?
The density of a sample of water is =998.00kg/m3 and the bulk modulus is =2.15GPa . What is the speed of sound through the sample?
What is the difference between kuhn and persistance length?
A fish finder uses a sonar device that sends 20,000-Hzsound pulses downward from the bottom of the boat, andthen detects echoes. If the maximum depth for which it isdesigned to work is 85 m, what is the minimum time betweenpulses (in fresh water)?
A set of scores ranges from a high X =72 to a low of X = 28. If these scores were put in a grouped frequency distribution table, what would be the best choice for the interval width?
The volume control on a surround sound amplifier is adjusted so the sound intensity level at the listining position increase from 22 to 66 dB. What is the raiton of the final sound intensity to the original sound intensity?
Following the analysis applied to the half-wave rectifier with capacitor filter, showhow to arrive at the output waveform for a center-tapped full-wave with filtercapacitor
A microphone receiving a pure sound tone feeds an oscilloscope, producing a wave on its screen. If the sound intensity is originally 2.00105W/m2 , but is turned up until the amplitude increases by 30.0% , what is the new intensity?
What is the length of a tube that has a fundamental frequency of 176 Hz and a first overtone of 352 Hz if the speed of sound is 343 m/s?